Hoi ( 宝飯郡 , Hoi-gun ) was a district located in eastern Aichi Prefecture , Japan .
97-455: As of 2008 (the last data available), the district had an estimated population of 21,766 with a density of 2,194 persons per km. Its total area was 9.92 km. Prior to its dissolution, the district consisted of only one town: Hoi District was one of the ancient districts of Mikawa Province , and is mentioned in Nara period records. Originally covering all of eastern Mikawa, Shitara District to
194-932: A breeding group is also known therefore as a gamodeme. This also implies that all members belong to the same species. If the gamodeme is very large (theoretically, approaching infinity), and all gene alleles are uniformly distributed by the gametes within it, the gamodeme is said to be panmictic. Under this state, allele ( gamete ) frequencies can be converted to genotype ( zygote ) frequencies by expanding an appropriate quadratic equation , as shown by Sir Ronald Fisher in his establishment of quantitative genetics. This seldom occurs in nature: localization of gamete exchange – through dispersal limitations, preferential mating, cataclysm, or other cause – may lead to small actual gamodemes which exchange gametes reasonably uniformly within themselves but are virtually separated from their neighboring gamodemes. However, there may be low frequencies of exchange with these neighbors. This may be viewed as
291-452: A concept devised by Mark Shriver and Tony Frudakis , is not an objective measure of the biological aspects of race as Shriver and Frudakis claim it is. She argues that it is actually just a "local category shaped by the U.S. context of its production, especially the forensic aim of being able to predict the race or ethnicity of an unknown suspect based on DNA found at the crime scene". Recent studies of human genetic clustering have included
388-602: A concept often translated as "race" was associated with supposed common descent from the Yellow Emperor , and used to stress the unity of ethnic groups in China. Brutal conflicts between ethnic groups have existed throughout history and across the world. The first post- Graeco-Roman published classification of humans into distinct races seems to be François Bernier 's Nouvelle division de la terre par les différents espèces ou races qui l'habitent ("New division of Earth by
485-404: A debate over how genetic variation is organized, with clusters and clines as the main possible orderings. Serre & Pääbo (2004) argued for smooth, clinal genetic variation in ancestral populations even in regions previously considered racially homogeneous, with the apparent gaps turning out to be artifacts of sampling techniques. Rosenberg et al. (2005) disputed this and offered an analysis of
582-476: A few programs, most notably the Chinese government's one-child per family policy, have resorted to coercive measures. In the 1970s, tension grew between population control advocates and women's health activists who advanced women's reproductive rights as part of a human rights -based approach. Growing opposition to the narrow population control focus led to a significant change in population control policies in
679-405: A great deal more diversity than elsewhere and that diversity should decrease the further from Africa a population is sampled. Hence, the 85% average figure is misleading: Long and Kittles find that rather than 85% of human genetic diversity existing in all human populations, about 100% of human diversity exists in a single African population, whereas only about 60% of human genetic diversity exists in
776-517: A host of other similarities and differences (for example, blood type) that do not correlate highly with the markers for race. Thus, anthropologist Frank Livingstone's conclusion was that, since clines cross racial boundaries, "there are no races, only clines". In a response to Livingstone, Theodore Dobzhansky argued that when talking about race one must be attentive to how the term is being used: "I agree with Dr. Livingstone that if races have to be 'discrete units', then there are no races, and if 'race'
873-723: A large multiethnic population in the United States, and "detected only modest genetic differentiation between different current geographic locales within each race/ethnicity group. Thus, ancient geographic ancestry, which is highly correlated with self-identified race/ethnicity – as opposed to current residence – is the major determinant of genetic structure in the U.S. population." Witherspoon et al. (2007) have argued that even when individuals can be reliably assigned to specific population groups, it may still be possible for two randomly chosen individuals from different populations/clusters to be more similar to each other than to
970-635: A locus-by-locus analysis of variation to derive taxonomy, it is possible to construct a human classification system based on characteristic genetic patterns, or clusters inferred from multilocus genetic data . Geographically based human studies since have shown that such genetic clusters can be derived from analyzing of a large number of loci which can assort individuals sampled into groups analogous to traditional continental racial groups. Joanna Mountain and Neil Risch cautioned that while genetic clusters may one day be shown to correspond to phenotypic variations between groups, such assumptions were premature as
1067-437: A population is a group of organisms of the same species which inhabit the same geographical area and are capable of interbreeding . The area of a sexual population is the area where interbreeding is possible between any opposite-sex pair within the area and more probable than cross-breeding with individuals from other areas. In humans , interbreeding is unrestricted by racial differences, as all humans belong to
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#17327825136941164-454: A product of the colonial enterprises of European powers from the 16th to 18th centuries which identified race in terms of skin color and physical differences. Author Rebecca F. Kennedy argues that the Greeks and Romans would have found such concepts confusing in relation to their own systems of classification. According to Bancel et al., the epistemological moment where the modern concept of race
1261-413: A race for political reasons. When people define and talk about a particular conception of race, they create a social reality through which social categorization is achieved. In this sense, races are said to be social constructs. These constructs develop within various legal, economic, and sociopolitical contexts, and may be the effect, rather than the cause, of major social situations. While race
1358-449: A randomly chosen member of their own cluster. They found that many thousands of genetic markers had to be used in order for the answer to the question "How often is a pair of individuals from one population genetically more dissimilar than two individuals chosen from two different populations?" to be "never". This assumed three population groups separated by large geographic ranges (European, African and East Asian). The entire world population
1455-458: A social construct, differences in genetic ancestry that happen to correlate to many of today's racial constructs are real". In response to Reich, a group of 67 scientists from a broad range of disciplines wrote that his concept of race was "flawed" as "the meaning and significance of the groups is produced through social interventions". Although commonalities in physical traits such as facial features, skin color, and hair texture comprise part of
1552-405: Is a broad scientific agreement that essentialist and typological conceptions of race are untenable, scientists around the world continue to conceptualize race in widely differing ways. While some researchers continue to use the concept of race to make distinctions among fuzzy sets of traits or observable differences in behavior, others in the scientific community suggest that the idea of race
1649-447: Is a natural taxonomy of the human species, because multiple other genetic patterns can be found in human populations that crosscut racial distinctions. Moreover, the genomic data underdetermines whether one wishes to see subdivisions (i.e., splitters) or a continuum (i.e., lumpers) . Under Kaplan and Winther's view, racial groupings are objective social constructions (see Mills 1998 ) that have conventional biological reality only insofar as
1746-627: Is also applied to non-human animals , microorganisms , and plants , and has specific uses within such fields as ecology and genetics . The word population is derived from the Late Latin populatio (a people, a multitude), which itself is derived from the Latin word populus (a people). In sociology and population geography , population refers to a group of human beings with some predefined feature in common, such as location, race , ethnicity , nationality , or religion . In ecology ,
1843-408: Is also observed for many alleles that vary from one human group to another. Another observation is that traits or alleles that vary from one group to another do not vary at the same rate. This pattern is referred to as nonconcordant variation. Because the variation of physical traits is clinal and nonconcordant, anthropologists of the late 19th and early 20th centuries discovered that the more traits and
1940-406: Is compatible with the observation that most human genetic variation is found within populations, not between them. It is also compatible with our finding that, even when the most distinct populations are considered and hundreds of loci are used, individuals are frequently more similar to members of other populations than to members of their own population." Anthropologists such as C. Loring Brace ,
2037-487: Is frequently criticized for perpetuating an outmoded understanding of human biological variation, and promoting stereotypes. Because in some societies racial groupings correspond closely with patterns of social stratification , for social scientists studying social inequality, race can be a significant variable . As sociological factors, racial categories may in part reflect subjective attributions, self-identities , and social institutions. Scholars continue to debate
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#17327825136942134-634: Is inherently naive or simplistic. Still others argue that, among humans, race has no taxonomic significance because all living humans belong to the same subspecies , Homo sapiens sapiens . Since the second half of the 20th century, race has been associated with discredited theories of scientific racism , and has become increasingly seen as a largely pseudoscientific system of classification. Although still used in general contexts, race has often been replaced by less ambiguous and/or loaded terms: populations , people (s) , ethnic groups , or communities , depending on context. Its use in genetics
2231-416: Is much more complex and studying an increasing number of groups would require an increasing number of markers for the same answer. The authors conclude that "caution should be used when using geographic or genetic ancestry to make inferences about individual phenotypes". Witherspoon, et al. concluded: "The fact that, given enough genetic data, individuals can be correctly assigned to their populations of origin
2328-609: Is not even known to the nearest million, so there is a considerable margin of error in such estimates. Researcher Carl Haub calculated that a total of over 100 billion people have probably been born in the last 2000 years. Population growth increased significantly as the Industrial Revolution gathered pace from 1700 onwards. The last 50 years have seen a yet more rapid increase in the rate of population growth due to medical advances and substantial increases in agricultural productivity, particularly beginning in
2425-653: Is not necessarily any evolutionary significance to these observed differences, so this form of classification has become less acceptable to evolutionary biologists. Likewise this typological approach to race is generally regarded as discredited by biologists and anthropologists. In 2000, philosopher Robin Andreasen proposed that cladistics might be used to categorize human races biologically, and that races can be both biologically real and socially constructed. Andreasen cited tree diagrams of relative genetic distances among populations published by Luigi Cavalli-Sforza as
2522-518: Is now called scientific racism . After the Nazi eugenics program, along with the rise of anti-colonial movements, racial essentialism lost widespread popularity. New studies of culture and the fledgling field of population genetics undermined the scientific standing of racial essentialism, leading race anthropologists to revise their conclusions about the sources of phenotypic variation. A significant number of modern anthropologists and biologists in
2619-611: Is often referred to as the demographic transition . Human population planning is the practice of altering the rate of growth of a human population. Historically, human population control has been implemented with the goal of limiting the rate of population growth. In the period from the 1950s to the 1980s, concerns about global population growth and its effects on poverty, environmental degradation , and political stability led to efforts to reduce population growth rates. While population control can involve measures that improve people's lives by giving them greater control of their reproduction,
2716-411: Is to say, found in diverse groups of people at different frequencies; (3) what was not cultural or polymorphic was principally clinal – that is to say, gradually variable over geography; and (4) what was left – the component of human diversity that was not cultural, polymorphic, or clinal – was very small. A consensus consequently developed among anthropologists and geneticists that race as
2813-422: Is understood to be a social construct by many, most scholars agree that race has real material effects in the lives of people through institutionalized practices of preference and discrimination . Socioeconomic factors, in combination with early but enduring views of race, have led to considerable suffering within disadvantaged racial groups. Racial discrimination often coincides with racist mindsets, whereby
2910-715: Is used as an 'explanation' of the human variability, rather than vice versa, then the explanation is invalid." He further argued that one could use the term race if one distinguished between "race differences" and "the race concept". The former refers to any distinction in gene frequencies between populations; the latter is "a matter of judgment". He further observed that even when there is clinal variation: "Race differences are objectively ascertainable biological phenomena ... but it does not follow that racially distinct populations must be given racial (or subspecific) labels." In short, Livingstone and Dobzhansky agree that there are genetic differences among human beings; they also agree that
3007-715: Is very likely that the world's population will stop growing before the end of the 21st century. Further, there is some likelihood that population will actually decline before 2100. Population has already declined in the last decade or two in Eastern Europe, the Baltics and in the former Commonwealth of Independent States. The population pattern of less-developed regions of the world in recent years has been marked by gradually declining birth rates. These followed an earlier sharp reduction in death rates. This transition from high birth and death rates to low birth and death rates
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3104-458: The Out of Africa and Multiregional models). In the early 20th century, many anthropologists taught that race was an entirely biological phenomenon and that this was core to a person's behavior and identity, a position commonly called racial essentialism . This, coupled with a belief that linguistic , cultural, and social groups fundamentally existed along racial lines, formed the basis of what
3201-623: The Tokugawa shogunate . The area was also a battlefield between the forces of the Imagawa clan and the Oda and Tokugawa clans during the late Sengoku period. In the cadastral reforms of the early Meiji period , on July 22, 1878 modern Hoi District was created, with its headquarters at Goyu-shuku , a former station on the Tōkaidō . With the organization of municipalities on October 1, 1889, Hoi District
3298-431: The one-drop rule used in the 19th-century United States to exclude those with any amount of African ancestry from the dominant racial grouping, defined as " white ". Such racial identities reflect the cultural attitudes of imperial powers dominant during the age of European colonial expansion . This view rejects the notion that race is biologically defined. According to geneticist David Reich , "while race may be
3395-512: The world , they speculated about the physical, social, and cultural differences among various human groups. The rise of the Atlantic slave trade , which gradually displaced an earlier trade in slaves from throughout the world, created a further incentive to categorize human groups in order to justify the subordination of African slaves . Drawing on sources from classical antiquity and upon their own internal interactions – for example,
3492-569: The 1960s, made by the Green Revolution . In 2017 the United Nations Population Division projected that the world's population would reach about 9.8 billion in 2050 and 11.2 billion in 2100. In the future, the world's population is expected to peak at some point, after which it will decline due to economic reasons, health concerns, land exhaustion and environmental hazards. According to one report, it
3589-800: The Human Genetic Diversity Panel showing that there were small discontinuities in the smooth genetic variation for ancestral populations at the location of geographic barriers such as the Sahara , the Oceans, and the Himalayas . Nonetheless, Rosenberg et al. (2005) stated that their findings "should not be taken as evidence of our support of any particular concept of biological race ... Genetic differences among human populations derive mainly from gradations in allele frequencies rather than from distinctive 'diagnostic' genotypes." Using
3686-594: The Mediterranean and up the Nile into Africa. From one end of this range to the other, there is no hint of a skin color boundary, and yet the spectrum runs from the lightest in the world at the northern edge to as dark as it is possible for humans to be at the equator. In part, this is due to isolation by distance . This point called attention to a problem common to phenotype-based descriptions of races (for example, those based on hair texture and skin color): they ignore
3783-496: The United States Census Bureau, the world population hit 6.5 billion on 24 February 2006. The United Nations Population Fund designated 12 October 1999 as the approximate day on which world population reached 6 billion. This was about 12 years after the world population reached 5 billion in 1987, and six years after the world population reached 5.5 billion in 1993. The population of countries such as Nigeria
3880-489: The West came to view race as an invalid genetic or biological designation. The first to challenge the concept of race on empirical grounds were the anthropologists Franz Boas , who provided evidence of phenotypic plasticity due to environmental factors, and Ashley Montagu , who relied on evidence from genetics. E. O. Wilson then challenged the concept from the perspective of general animal systematics, and further rejected
3977-505: The anthropologist Stephen Molnar has suggested that the discordance of clines inevitably results in a multiplication of races that renders the concept itself useless. The Human Genome Project states "People who have lived in the same geographic region for many generations may have some alleles in common, but no allele will be found in all members of one population and in no members of any other." Massimo Pigliucci and Jonathan Kaplan argue that human races do exist, and that they correspond to
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4074-437: The basis for a phylogenetic tree of human races (p. 661). Biological anthropologist Jonathan Marks (2008) responded by arguing that Andreasen had misinterpreted the genetic literature: "These trees are phenetic (based on similarity), rather than cladistic (based on monophyletic descent, that is from a series of unique ancestors)." Evolutionary biologist Alan Templeton (2013) argued that multiple lines of evidence falsify
4171-470: The belief that humans can be divided based on the superiority of one race over another. Social conceptions and groupings of races have varied over time, often involving folk taxonomies that define essential types of individuals based on perceived traits. Modern scientists consider such biological essentialism obsolete, and generally discourage racial explanations for collective differentiation in both physical and behavioral traits. Even though there
4268-480: The breaking up of a large sexual population (panmictic) into smaller overlapping sexual populations. This failure of panmixia leads to two important changes in overall population structure: (1) the component gamodemes vary (through gamete sampling) in their allele frequencies when compared with each other and with the theoretical panmictic original (this is known as dispersion, and its details can be estimated using expansion of an appropriate binomial equation ); and (2)
4365-416: The categories are chosen and constructed for pragmatic scientific reasons. In earlier work, Winther had identified "diversity partitioning" and "clustering analysis" as two separate methodologies, with distinct questions, assumptions, and protocols. Each is also associated with opposing ontological consequences vis-a-vis the metaphysics of race. Philosopher Lisa Gannett has argued that biogeographical ancestry,
4462-428: The claim that "races" were equivalent to "subspecies". Human genetic variation is predominantly within races, continuous, and complex in structure, which is inconsistent with the concept of genetic human races. According to the biological anthropologist Jonathan Marks , By the 1970s, it had become clear that (1) most human differences were cultural; (2) what was not cultural was principally polymorphic – that
4559-543: The clustering would be different. Weiss and Fullerton have noted that if one sampled only Icelanders, Mayans and Maoris, three distinct clusters would form and all other populations could be described as being clinally composed of admixtures of Maori, Icelandic and Mayan genetic materials. Kaplan and Winther therefore argue that, seen in this way, both Lewontin and Edwards are right in their arguments. They conclude that while racial groups are characterized by different allele frequencies, this does not mean that racial classification
4656-450: The consequence that the number and geographic location of any described races is highly dependent on the importance attributed to, and quantity of, the traits considered. A skin-lightening mutation, estimated to have occurred 20,000 to 50,000 years ago, partially accounts for the appearance of light skin in people who migrated out of Africa northward into what is now Europe. East Asians owe their relatively light skin to different mutations. On
4753-434: The degrees to which racial categories are biologically warranted and socially constructed. For example, in 2008, John Hartigan Jr. argued for a view of race that focused primarily on culture, but which does not ignore the potential relevance of biology or genetics. Accordingly, the racial paradigms employed in different disciplines vary in their emphasis on biological reduction as contrasted with societal construction. In
4850-459: The different species or races which inhabit it"), published in 1684. In the 18th century the differences among human groups became a focus of scientific investigation. But the scientific classification of phenotypic variation was frequently coupled with racist ideas about innate predispositions of different groups, always attributing the most desirable features to the White, European race and arranging
4947-522: The difficulty of defining a population, the clinal nature of variation, and heterogeneity across the genome (Long and Kittles 2003). In general, however, an average of 85% of statistical genetic variation exists within local populations, ≈7% is between local populations within the same continent, and ≈8% of variation occurs between large groups living on different continents. The recent African origin theory for humans would predict that in Africa there exists
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#17327825136945044-404: The early 1980s. Race (human categorization) Race is a categorization of humans based on shared physical or social qualities into groups generally viewed as distinct within a given society . The term came into common usage during the 16th century, when it was used to refer to groups of various kinds, including those characterized by close kinship relations. By the 17th century,
5141-676: The former, and a more liberal view on race by the latter. Today, all humans are classified as belonging to the species Homo sapiens . However, this is not the first species of homininae : the first species of genus Homo , Homo habilis , evolved in East Africa at least 2 million years ago, and members of this species populated different parts of Africa in a relatively short time. Homo erectus evolved more than 1.8 million years ago, and by 1.5 million years ago had spread throughout Europe and Asia. Virtually all physical anthropologists agree that Archaic Homo sapiens (A group including
5238-406: The frequency of one or more of the genes it possesses. It is an arbitrary matter which, and how many, gene loci we choose to consider as a significant 'constellation'". Leonard Lieberman and Rodney Kirk have pointed out that "the paramount weakness of this statement is that if one gene can distinguish races then the number of races is as numerous as the number of human couples reproducing". Moreover,
5335-815: The genetic classification of ecotypes , but that real human races do not correspond very much, if at all, to folk racial categories. In contrast, Walsh & Yun reviewed the literature in 2011 and reported: "Genetic studies using very few chromosomal loci find that genetic polymorphisms divide human populations into clusters with almost 100 percent accuracy and that they correspond to the traditional anthropological categories." Some biologists argue that racial categories correlate with biological traits (e.g. phenotype ), and that certain genetic markers have varying frequencies among human populations, some of which correspond more or less to traditional racial groupings. The distribution of genetic variants within and among human populations are impossible to describe succinctly because of
5432-437: The haplotype for beta-S hemoglobin , on the other hand, radiate out of specific geographical points in Africa. As the anthropologists Leonard Lieberman and Fatimah Linda Jackson observed, "Discordant patterns of heterogeneity falsify any description of a population as if it were genotypically or even phenotypically homogeneous". Patterns such as those seen in human physical and genetic variation as described above, have led to
5529-439: The historical process of exploration and conquest which brought Europeans into contact with groups from different continents, and of the ideology of classification and typology found in the natural sciences. The term race was often used in a general biological taxonomic sense , starting from the 19th century, to denote genetically differentiated human populations defined by phenotype. The modern concept of race emerged as
5626-690: The hostility between the English and Irish powerfully influenced early European thinking about the differences between people – Europeans began to sort themselves and others into groups based on physical appearance, and to attribute to individuals belonging to these groups behaviors and capacities which were claimed to be deeply ingrained. A set of folk beliefs took hold that linked inherited physical differences between groups to inherited intellectual , behavioral , and moral qualities. Similar ideas can be found in other cultures, for example in China , where
5723-524: The idea of a phylogenetic tree structure to human genetic diversity, and confirm the presence of gene flow among populations. Marks, Templeton, and Cavalli-Sforza all conclude that genetics does not provide evidence of human races. Previously, anthropologists Lieberman and Jackson (1995) had also critiqued the use of cladistics to support concepts of race. They argued that "the molecular and biochemical proponents of this model explicitly use racial categories in their initial grouping of samples ". For example,
5820-521: The individuals and ideologies of one group come to perceive the members of an outgroup as both racially defined and morally inferior. As a result, racial groups possessing relatively little power often find themselves excluded or oppressed, while hegemonic individuals and institutions are charged with holding racist attitudes. Racism has led to many instances of tragedy, including slavery and genocide . In some countries, law enforcement uses race to profile suspects. This use of racial categories
5917-422: The large and highly diverse macroethnic groups of East Indians, North Africans, and Europeans are presumptively grouped as Caucasians prior to the analysis of their DNA variation. They argued that this a priori grouping limits and skews interpretations, obscures other lineage relationships, deemphasizes the impact of more immediate clinal environmental factors on genomic diversity, and can cloud our understanding of
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#17327825136946014-443: The largest groups of social relevance, and these definitions can change over time. Historical race concepts have included a wide variety of schemes to divide local or worldwide populations into races and sub-races. Across the world, different organizations and societies choose to disambiguate race to different extents: The establishment of racial boundaries often involves the subjugation of groups defined as racially inferior, as in
6111-672: The last two decades of the 18th century, the theory of polygenism , the belief that different races had evolved separately in each continent and shared no common ancestor, was advocated in England by historian Edward Long and anatomist Charles White , in Germany by ethnographers Christoph Meiners and Georg Forster , and in France by Julien-Joseph Virey . In the US, Samuel George Morton , Josiah Nott and Louis Agassiz promoted this theory in
6208-565: The least diverse population they analyzed (the Surui, a population derived from New Guinea). Statistical analysis that takes this difference into account confirms previous findings that "Western-based racial classifications have no taxonomic significance". A 2002 study of random biallelic genetic loci found little to no evidence that humans were divided into distinct biological groups. In his 2003 paper, " Human Genetic Diversity: Lewontin's Fallacy ", A. W. F. Edwards argued that rather than using
6305-419: The level of alleles and allele frequencies. Nature has not created four or five distinct, nonoverlapping genetic groups of people. Another way to look at differences between populations is to measure genetic differences rather than physical differences between groups. The mid-20th-century anthropologist William C. Boyd defined race as: "A population which differs significantly from other populations in regard to
6402-463: The level of homozygosity rises in the entire collection of gamodemes. The overall rise in homozygosity is quantified by the inbreeding coefficient (f or φ). All homozygotes are increased in frequency – both the deleterious and the desirable. The mean phenotype of the gamodemes collection is lower than that of the panmictic original – which is known as inbreeding depression. It is most important to note, however, that some dispersion lines will be superior to
6499-623: The mid-19th century. Polygenism was popular and most widespread in the 19th century, culminating in the founding of the Anthropological Society of London (1863), which, during the period of the American Civil War, broke away from the Ethnological Society of London and its monogenic stance , their underlined difference lying, relevantly, in the so-called "Negro question": a substantial racist view by
6596-420: The more human groups they measured, the fewer discrete differences they observed among races and the more categories they had to create to classify human beings. The number of races observed expanded to the 1930s and 1950s, and eventually anthropologists concluded that there were no discrete races. Twentieth and 21st century biomedical researchers have discovered this same feature when evaluating human variation at
6693-561: The north was separated from Hoi in 903. The district contained the provincial capital of Mikawa along with the provincial temple , both of which were located in what is now part of the city of Toyokawa . During the Sengoku period , the area was controlled by various samurai clans, including the Makino and branches of the Honda and Matsudaira clans , all of whom rose to high positions within
6790-514: The other hand, the greater the number of traits (or alleles ) considered, the more subdivisions of humanity are detected, since traits and gene frequencies do not always correspond to the same geographical location. Or as Ossorio & Duster (2005) put it: Anthropologists long ago discovered that humans' physical traits vary gradually, with groups that are close geographic neighbors being more similar than groups that are geographically separated. This pattern of variation, known as clinal variation,
6887-416: The other races along a continuum of progressively undesirable attributes. The 1735 classification of Carl Linnaeus , inventor of zoological taxonomy, divided the human species Homo sapiens into continental varieties of europaeus , asiaticus , americanus , and afer , each associated with a different humour : sanguine , melancholic , choleric , and phlegmatic , respectively. Homo sapiens europaeus
6984-418: The panmictic original, while some will be about the same, and some will be inferior. The probabilities of each can be estimated from those binomial equations. In plant and animal breeding , procedures have been developed which deliberately utilize the effects of dispersion (such as line breeding, pure-line breeding, backcrossing). Dispersion-assisted selection leads to the greatest genetic advance (ΔG=change in
7081-771: The phenotypic mean), and is much more powerful than selection acting without attendant dispersion. This is so for both allogamous (random fertilization) and autogamous (self-fertilization) gamodemes. According to the UN, the world's population surpassed 8 billion on 15 November 2022, an increase of 1 billion since 12 March 2012. According to a separate estimate by the United Nations, Earth's population exceeded seven billion in October 2011. According to UNFPA , growth to such an extent offers unprecedented challenges and opportunities to all of humanity. According to papers published by
7178-400: The philosophers Jonathan Kaplan and Rasmus Winther, and the geneticist Joseph Graves , have argued that the cluster structure of genetic data is dependent on the initial hypotheses of the researcher and the influence of these hypotheses on the choice of populations to sample. When one samples continental groups, the clusters become continental, but if one had chosen other sampling patterns,
7275-408: The policing and disproportionate incarceration of certain groups. Groups of humans have always identified themselves as distinct from neighboring groups, but such differences have not always been understood to be natural, immutable and global. These features are the distinguishing features of how the concept of race is used today. In this way the idea of race as we understand it today came about during
7372-686: The possible species H. heidelbergensis , H. rhodesiensis , and H. neanderthalensis ) evolved out of African H. erectus ( sensu lato ) or H. ergaster . Anthropologists support the idea that anatomically modern humans ( Homo sapiens ) evolved in North or East Africa from an archaic human species such as H. heidelbergensis and then migrated out of Africa, mixing with and replacing H. heidelbergensis and H. neanderthalensis populations throughout Europe and Asia, and H. rhodesiensis populations in Sub-Saharan Africa (a combination of
7469-878: The previous generation had known it – as largely discrete, geographically distinct, gene pools – did not exist. The term race in biology is used with caution because it can be ambiguous. Generally, when it is used it is effectively a synonym of subspecies . (For animals, the only taxonomic unit below the species level is usually the subspecies; there are narrower infraspecific ranks in botany , and race does not correspond directly with any of them.) Traditionally, subspecies are seen as geographically isolated and genetically differentiated populations. Studies of human genetic variation show that human populations are not geographically isolated. and their genetic differences are far smaller than those among comparable subspecies. In 1978, Sewall Wright suggested that human populations that have long inhabited separated parts of
7566-403: The race concept, this linkage is a social distinction rather than an inherently biological one. Other dimensions of racial groupings include shared history, traditions, and language. For instance, African-American English is a language spoken by many African Americans , especially in areas of the United States where racial segregation exists. Furthermore, people often self-identify as members of
7663-523: The races. Blumenbach also noted the graded transition in appearances from one group to adjacent groups and suggested that "one variety of mankind does so sensibly pass into the other, that you cannot mark out the limits between them". From the 17th through 19th centuries, the merging of folk beliefs about group differences with scientific explanations of those differences produced what Smedley has called an " ideology of race". According to this ideology, races are primordial, natural, enduring and distinct. It
7760-592: The relationship between genes and complex traits remains poorly understood. However, Risch denied such limitations render the analysis useless: "Perhaps just using someone's actual birth year is not a very good way of measuring age. Does that mean we should throw it out? ... Any category you come up with is going to be imperfect, but that doesn't preclude you from using it or the fact that it has utility." Early human genetic cluster analysis studies were conducted with samples taken from ancestral population groups living at extreme geographic distances from each other. It
7857-405: The remaining number of villages was reduced from 25 to 11 in 1906. The district office was transferred to the town of Kō in 1923. The village of Katahara was raised to town status on April 1, 1924, the village of Kosakai on September 12, 1926, and the village of Mito on February 11, 1930. On September 1, 1932, the town of Shimoji was annexed by the neighboring city of Toyohashi . The city of Toyokawa
7954-500: The same species of Homo sapiens. In ecology, the population of a certain species in a certain area can be estimated using the Lincoln index to calculate the total population of an area based on the number of individuals observed. In genetics, a population is often defined as a set of organisms in which any pair of members can breed together. They can thus routinely exchange gametes in order to have usually fertile progeny, and such
8051-411: The social sciences, theoretical frameworks such as racial formation theory and critical race theory investigate implications of race as social construction by exploring how the images, ideas and assumptions of race are expressed in everyday life. A large body of scholarship has traced the relationships between the historical, social production of race in legal and criminal language, and their effects on
8148-449: The structure of the district became six towns and one village. On April 1, 1959, the town of Goyu was annexed by the city of Toyokawa. The village of Ichinomiya was raised to town status on April 1, 1961. The towns of Katahara and Nishiura were annexed by the city of Gamagōri on April 1, 1962 and April 1, 1963 respectively. In a final round of mergers , the town of Ichinomiya was annexed by the city of Toyokawa on February 1, 2006, followed by
8245-399: The term began to refer to physical ( phenotypical ) traits, and then later to national affiliations. Modern science regards race as a social construct , an identity which is assigned based on rules made by society. While partly based on physical similarities within groups, race does not have an inherent physical or biological meaning. The concept of race is foundational to racism ,
8342-407: The towns of Otowa and Mito on January 15, 2008. When the town of Kozakai was merged into Toyokawa on February 1, 2010, Hoi ceased to exist as an administrative division. Population Population is the term typically used to refer to the number of people in a single area. Governments conduct a census to quantify the size of a resident population within a given jurisdiction. The term
8439-1092: The true patterns of affinity. In 2015, Keith Hunley, Graciela Cabana, and Jeffrey Long analyzed the Human Genome Diversity Project sample of 1,037 individuals in 52 populations, finding that diversity among non-African populations is the result of a serial founder effect process, with non-African populations as a whole nested among African populations, that "some African populations are equally related to other African populations and to non-African populations", and that "outside of Africa, regional groupings of populations are nested inside one another, and many of them are not monophyletic". Earlier research had also suggested that there has always been considerable gene flow between human populations, meaning that human population groups are not monophyletic. Rachel Caspari has argued that, since no groups currently regarded as races are monophyletic, by definition none of these groups can be clades. One crucial innovation in reconceptualizing genotypic and phenotypic variation
8536-443: The use of the race concept to classify people, and how the race concept is used, is a matter of social convention. They differ on whether the race concept remains a meaningful and useful social convention. In 1964, the biologists Paul Ehrlich and Holm pointed out cases where two or more clines are distributed discordantly – for example, melanin is distributed in a decreasing pattern from the equator north and south; frequencies for
8633-571: The world should, in general, be considered different subspecies by the criterion that most individuals of such populations can be allocated correctly by inspection. Wright argued: "It does not require a trained anthropologist to classify an array of Englishmen, West Africans, and Chinese with 100% accuracy by features, skin color, and type of hair despite so much variability within each of these groups that every individual can easily be distinguished from every other." While in practice subspecies are often defined by easily observable physical appearance, there
8730-713: Was described as active, acute, and adventurous, whereas Homo sapiens afer was said to be crafty, lazy, and careless. The 1775 treatise "The Natural Varieties of Mankind", by Johann Friedrich Blumenbach proposed five major divisions: the Caucasoid race , the Mongoloid race , the Ethiopian race (later termed Negroid ), the American Indian race , and the Malayan race , but he did not propose any hierarchy among
8827-407: Was divided into 33 villages. The villages of Gamagōri and Uchikubo were elevated to town status on October 6, 1891. They were followed in rapid succession by the village of Shimoji (October 16, 1891), the village of Goyu (January 29, 1892), the village of Toyokawa (March 13, 1893), the villages of Akasaka and Kō (June 23, 1894), and the village of Miya (December 10, 1894). In a round of consolidation,
8924-400: Was formally renounced by the U.S. National Academies of Sciences, Engineering, and Medicine in 2023. Modern scholarship views racial categories as socially constructed, that is, race is not intrinsic to human beings but rather an identity created, often by socially dominant groups, to establish meaning in a social context. Different cultures define different racial groups, often focused on
9021-410: Was formed on June 1, 1943 by the merger of the towns of Toyokawa, Ushikubo and Kō, and the village of Yawata. The village of Nishiura was raised to town status on February 11, 1944. On April 1, 1954, the city was Gamagōri was formed by the merger of the towns of Gamagōri and Miya, and the village of Shiotsu. In a further round of consolidations in 1955, the town of Otowa was formed on April 1, 1955 and
9118-690: Was further argued that some groups may be the result of mixture between formerly distinct populations, but that careful study could distinguish the ancestral races that had combined to produce admixed groups. Subsequent influential classifications by Georges Buffon , Petrus Camper and Christoph Meiners all classified "Negros" as inferior to Europeans. In the United States the racial theories of Thomas Jefferson were influential. He saw Africans as inferior to Whites especially in regards to their intellect, and imbued with unnatural sexual appetites, but described Native Americans as equals to whites. In
9215-594: Was invented and rationalized lies somewhere between 1730 and 1790. According to Smedley and Marks the European concept of "race", along with many of the ideas now associated with the term, arose at the time of the scientific revolution , which introduced and privileged the study of natural kinds , and the age of European imperialism and colonization which established political relations between Europeans and peoples with distinct cultural and political traditions . As Europeans encountered people from different parts of
9312-457: Was the anthropologist C. Loring Brace 's observation that such variations, insofar as they are affected by natural selection , slow migration, or genetic drift , are distributed along geographic gradations or clines . For example, with respect to skin color in Europe and Africa, Brace writes: To this day, skin color grades by imperceptible means from Europe southward around the eastern end of
9409-535: Was thought that such large geographic distances would maximize the genetic variation between the groups sampled in the analysis, and thus maximize the probability of finding cluster patterns unique to each group. In light of the historically recent acceleration of human migration (and correspondingly, human gene flow) on a global scale, further studies were conducted to judge the degree to which genetic cluster analysis can pattern ancestrally identified groups as well as geographically separated groups. One such study looked at
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