43-542: Gender Female Other names Related names Joan, Xoana [REDACTED] Engraving of Joana of Portugal Joana is a given name, equivalent to Joanna in Catalan ( IPA: [ʒuˈanə] ) and Portuguese ( IPA: [ʒuˈɐnɐ] ). The Galician form of the name is Xoana ( IPA: [ʃoˈanɐ] ). It may refer to: Joana Angélica (1761–1822), Brazilian Conceptionist nun, belonging to
86-426: A sexual system termed gynodioecy . In a few species, female individuals coexist with males and hermaphrodites ; this sexual system is called trioecy . In Thor manningi (a species of shrimp), females coexist with males and protandrous hermaphrodites . A distinguishing characteristic of the class Mammalia is the presence of mammary glands . Mammary glands are modified sweat glands that produce milk, which
129-665: A Brazilian actress Joana Rokomatu – a Fijian chief Joana Zimmer – a German pop music singer See also [ edit ] Joanna [REDACTED] Name list This page or section lists people that share the same given name . If an internal link led you here, you may wish to change that link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Joana&oldid=1243412617 " Category : Given names Hidden categories: Pages with Catalan IPA Pages with Portuguese IPA Pages with Galician IPA Articles with short description Short description
172-431: A male, while an X sperm and an X egg produce a female. The ZW sex-determination system , where females have ZW (as opposed to ZZ in males) sex chromosomes, is found in birds, reptiles and some insects and other organisms. The young of some species develop into one sex or the other depending on local environmental conditions, e.g. the sex of crocodilians is influenced by the temperature of their eggs. Other species (such as
215-406: A person's sex or gender identity . The word can also refer to the shape of connectors and fasteners , such as screws, electrical pins, and technical equipment. Under this convention, sockets and receptacles are called female, and the corresponding plugs male . Females produce ova , the larger gametes in a heterogamous reproduction system , while the smaller and usually motile gametes,
258-432: A range of people without reference to age (e.g., girls ) or social status (e.g., lady ). As an adjective, female is still used in some contexts, particularly when the sex of the person is relevant, such as female athletes or to distinguish a male nurse from a female one. Biological sex is conceptually distinct from gender , although they are often used interchangeably. The adjective female can describe
301-581: A small cross underneath, is commonly used to represent females. Joseph Justus Scaliger once speculated that the symbol was associated with Venus, goddess of beauty , because it resembles a bronze mirror with a handle, but modern scholars consider that fanciful, and the most established view is that the female and male symbols derive from contractions in Greek script of the Greek names of the planets Thouros (Mars) and Phosphoros (Venus). Mammal A mammal (from Latin mamma 'breast')
344-675: Is a vertebrate animal of the class Mammalia ( / m ə ˈ m eɪ l i . ə / ). Mammals are characterized by the presence of milk -producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair , and three middle ear bones . These characteristics distinguish them from reptiles and birds , from which their ancestors diverged in the Carboniferous Period over 300 million years ago. Around 6,400 extant species of mammals have been described and divided into 27 orders . The largest orders of mammals, by number of species , are
387-406: Is also a hypothesis that female genital evolution is the result of pleiotropy , i.e. unrelated genes that are affected by environmental conditions like low food also affect genitals. This hypothesis is unlikely to apply to a significant number of species, but natural selection in general has some role in female genital evolution. The symbol ♀ ( Unicode : U+2640 Alt codes : Alt+12), a circle with
430-468: Is different from Wikidata All set index articles Female An organism 's sex is female ( symbol : ♀ ) if it produces the ovum (egg cell), the type of gamete (sex cell) that fuses with the male gamete (sperm cell) during sexual reproduction . A female has larger gametes than a male . Females and males are results of the anisogamous reproduction system , wherein gametes are of different sizes (unlike isogamy where they are
473-488: Is no fossil record of its emergence. Numerous theories exist as to why anisogamy emerged. Many share a common thread, in that larger female gametes are more likely to survive, and that smaller male gametes are more likely to find other gametes because they can travel faster. Current models often fail to account for why isogamy remains in a few species. Anisogamy appears to have evolved multiple times from isogamy; for example female Volvocales (a type of green algae) evolved from
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#1732786866644516-555: Is not limited to animals; egg cells are produced by chytrids , diatoms , water moulds and land plants , among others. In land plants, female and male designate not only the egg- and sperm-producing organisms and structures, but also the structures of the sporophytes that give rise to male and female plants . Species that are divided into females and males are classified as gonochoric in animals, as dioecious in seed plants and as dioicous in cryptogams . In some species, female and hermaphrodite individuals may coexist,
559-572: Is primarily driven by human poaching and habitat destruction , primarily deforestation . Over 70% of mammal species are in the orders Rodentia , Chiroptera , and Eulipotyphla . Mammal classification has been through several revisions since Carl Linnaeus initially defined the class, and at present , no classification system is universally accepted. McKenna & Bell (1997) and Wilson & Reeder (2005) provide useful recent compendiums. Simpson (1945) provides systematics of mammal origins and relationships that had been taught universally until
602-426: Is the viviparous placental mammals , so named for the temporary organ ( placenta ) used by offspring to draw nutrition from the mother during gestation . Most mammals are intelligent , with some possessing large brains, self-awareness , and tool use . Mammals can communicate and vocalize in several ways, including the production of ultrasound , scent marking , alarm signals , singing , echolocation ; and, in
645-494: Is used to feed the young for some time after birth. Only mammals produce milk . Mammary glands are obvious in humans , because the female human body stores large amounts of fatty tissue near the nipples, resulting in prominent breasts . Mammary glands are present in all mammals, although they are normally redundant in males of the species. Most mammalian females have two copies of the X chromosome , while males have only one X and one smaller Y chromosome ; some mammals, such as
688-473: The Cretaceous . The relationships between these three lineages is contentious, and all three possible hypotheses have been proposed with respect to which group is basal . These hypotheses are Atlantogenata (basal Boreoeutheria), Epitheria (basal Xenarthra) and Exafroplacentalia (basal Afrotheria). Boreoeutheria in turn contains two major lineages— Euarchontoglires and Laurasiatheria . Estimates for
731-564: The International Union for Conservation of Nature (IUCN) completed a five-year Global Mammal Assessment for its IUCN Red List , which counted 5,488 species. According to research published in the Journal of Mammalogy in 2018, the number of recognized mammal species is 6,495, including 96 recently extinct. The word " mammal " is modern, from the scientific name Mammalia coined by Carl Linnaeus in 1758, derived from
774-556: The Latin mamma ("teat, pap"). In an influential 1988 paper, Timothy Rowe defined Mammalia phylogenetically as the crown group of mammals, the clade consisting of the most recent common ancestor of living monotremes ( echidnas and platypuses ) and therian mammals ( marsupials and placentals ) and all descendants of that ancestor. Since this ancestor lived in the Jurassic period, Rowe's definition excludes all animals from
817-606: The biological classification scheme used, are the primates : apes , monkeys , and lemurs ; the Cetartiodactyla : whales and even-toed ungulates ; and the Carnivora which includes cats , dogs , weasels , bears , seals , and allies. According to Mammal Species of the World , 5,416 species were identified in 2006. These were grouped into 1,229 genera , 153 families and 29 orders. In 2008,
860-406: The dominant terrestrial animal group from 66 million years ago to the present. The basic mammalian body type is quadrupedal , with most mammals using four limbs for terrestrial locomotion ; but in some, the limbs are adapted for life at sea , in the air , in trees or underground . The bipeds have adapted to move using only the two lower limbs, while the rear limbs of cetaceans and
903-433: The goby ) can transform, as adults, from one sex to the other in response to local reproductive conditions (such as a brief shortage of males). The question of how females evolved is mainly a question of why males evolved. The first organisms reproduced asexually, usually via binary fission , wherein a cell splits itself in half. From a strict numbers perspective, a species that is half males/half females can produce half
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#1732786866644946-449: The platypus , have different combinations. One of the female's X chromosomes is randomly inactivated in each cell of placental mammals while the paternally derived X is inactivated in marsupials. In birds and some reptiles, by contrast, it is the female which is heterozygous and carries a Z and a W chromosome while the male carries two Z chromosomes. In mammals, females can have XXX or X . Mammalian females bear live young , with
989-428: The rodents , bats , and Eulipotyphla (including hedgehogs , moles and shrews ). The next three are the primates (including humans , monkeys and lemurs ), the even-toed ungulates (including pigs , camels , and whales ), and the Carnivora (including cats , dogs , and seals ). Mammals are the only living members of Synapsida ; this clade , together with Sauropsida (reptiles and birds), constitutes
1032-439: The sea cows are mere internal vestiges . Mammals range in size from the 30–40 millimetres (1.2–1.6 in) bumblebee bat to the 30 metres (98 ft) blue whale —possibly the largest animal to have ever lived. Maximum lifespan varies from two years for the shrew to 211 years for the bowhead whale . All modern mammals give birth to live young, except the five species of monotremes , which lay eggs. The most species-rich group
1075-484: The spermatozoa , are produced by males. Generally, a female cannot reproduce sexually without access to the gametes of a male, and vice versa, but in some species females can reproduce by themselves asexually , for example via parthenogenesis . Patterns of sexual reproduction include: Other than the defining difference in the type of gamete produced, differences between males and females in one lineage cannot always be predicted by differences in another. The concept
1118-800: The Reformed Order of Our Lady of Conception, and martyr of the Brazilian Independence Joana Benedek – a Mexican actress Joana of Braganza , a.k.a. Joana of Portugal (1635-1653) – a Portuguese princess, daughter of John IV Joana Ceddia – a Brazilian-Canadian YouTuber Joana Glaza – the Lithuanian lead singer of rock group Joana and the Wolf Joana Kuntz , professor of psychology in New Zealand Joana Prado –
1161-492: The case of humans, complex language . Mammals can organize themselves into fission–fusion societies , harems , and hierarchies —but can also be solitary and territorial . Most mammals are polygynous , but some can be monogamous or polyandrous . Domestication of many types of mammals by humans played a major role in the Neolithic Revolution , and resulted in farming replacing hunting and gathering as
1204-812: The clade originating with the last common ancestor of Sinoconodon and living mammals. The earliest-known synapsid satisfying Kemp's definitions is Tikitherium , dated 225 Ma , so the appearance of mammals in this broader sense can be given this Late Triassic date. However, this animal may have actually evolved during the Neogene. As of the early 21st century, molecular studies based on DNA analysis have suggested new relationships among mammal families. Most of these findings have been independently validated by retrotransposon presence/absence data . Classification systems based on molecular studies reveal three major groups or lineages of placental mammals— Afrotheria , Xenarthra and Boreoeutheria —which diverged in
1247-444: The closest thing to an official classification of mammals, despite its known issues. Most mammals, including the six most species-rich orders , belong to the placental group. The three largest orders in numbers of species are Rodentia : mice , rats , porcupines , beavers , capybaras , and other gnawing mammals; Chiroptera : bats; and Eulipotyphla : shrews , moles , and solenodons . The next three biggest orders, depending on
1290-502: The course of an organism's life. The sex of most mammals, including humans, is genetically determined by the XY sex-determination system where females have XX (as opposed to XY in males) sex chromosomes . It is also possible in a variety of species, including humans, to have other karyotypes . During reproduction , the male contributes either an X sperm or a Y sperm, while the female always contributes an X egg. A Y sperm and an X egg produce
1333-585: The earlier Triassic , despite the fact that Triassic fossils in the Haramiyida have been referred to the Mammalia since the mid-19th century. If Mammalia is considered as the crown group, its origin can be roughly dated as the first known appearance of animals more closely related to some extant mammals than to others. Ambondro is more closely related to monotremes than to therian mammals while Amphilestes and Amphitherium are more closely related to
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1376-451: The end of the 20th century. However, since 1945, a large amount of new and more detailed information has gradually been found: The paleontological record has been recalibrated, and the intervening years have seen much debate and progress concerning the theoretical underpinnings of systematization itself, partly through the new concept of cladistics . Though fieldwork and lab work progressively outdated Simpson's classification, it remains
1419-459: The exception of monotreme females, which lay eggs. Some non-mammalian species, such as guppies , have analogous reproductive structures; and some other non-mammals, such as some sharks , also bear live young. In sex determination for mammals, female is the default sex, while in the poplar genus Populus the default is male. The sex of a particular organism may be determined by genetic or environmental factors, or may naturally change during
1462-668: The larger Amniota clade. Early synapsids are referred to as " pelycosaurs ." The more advanced therapsids became dominant during the Guadalupian . Mammals originated from cynodonts , an advanced group of therapsids, during the Late Triassic to Early Jurassic . Mammals achieved their modern diversity in the Paleogene and Neogene periods of the Cenozoic era, after the extinction of non-avian dinosaurs , and have been
1505-484: The late 14th century the English spelling was altered to parallel that of male . It has been used as both noun and adjective since the 14th century. Originally, from its first appearance in the 1300s, female exclusively referred to humans and always indicated that the speaker spoke of a woman or a girl. A century later, the meaning was expanded to include non-human female organisms. For several centuries, using
1548-400: The offspring an asexual population can, because only the females are having offspring. Being male can also carry significant costs, such as in flashy sexual displays in animals (such as big antlers or colorful feathers), or needing to produce an outsized amount of pollen as a plant in order to get a chance to fertilize a female. Yet despite the costs of being male, there must be some advantage to
1591-928: The plus mating type . Although sexual evolution emerged at least 1.2 billion years ago, the lack of anisogamous fossil records make it hard to pinpoint when females evolved. Female sex organs (genitalia, in animals) have an extreme range of variation among species and even within species. The evolution of female genitalia remains poorly understood compared to male genitalia, reflecting a now-outdated belief that female genitalia are less varied than male genitalia, and thus less useful to study. The difficulty of reaching female genitalia has also complicated their study. New 3D technology has made female genital study simpler. Genitalia evolve very quickly. There are three main hypotheses as to what impacts female genital evolution: lock-and-key (genitals must fit together), cryptic female choice (females affect whether males can fertilize them), and sexual conflict (a sort of sexual arms race). There
1634-716: The primary source of food for humans. This led to a major restructuring of human societies from nomadic to sedentary, with more co-operation among larger and larger groups, and ultimately the development of the first civilizations . Domesticated mammals provided, and continue to provide, power for transport and agriculture, as well as food ( meat and dairy products ), fur , and leather . Mammals are also hunted and raced for sport, kept as pets and working animals of various types, and are used as model organisms in science. Mammals have been depicted in art since Paleolithic times, and appear in literature, film, mythology, and religion. Decline in numbers and extinction of many mammals
1677-459: The process. The advantages are explained by the evolution of anisogamy , which led to the evolution of male and female function. Before the evolution of anisogamy, mating types in a species were isogamous : the same size and both could move, catalogued only as "+" or "-" types. In anisogamy, the mating cells are called gametes. The female gamete is larger than the male gamete, and usually immotile. Anisogamy remains poorly understood, as there
1720-512: The reproductive system , as with mammary glands in mammals. In humans, the word female can also be used to refer to gender in the social sense of gender role or gender identity . The word female comes from the Latin femella , the diminutive form of femina , meaning " woman ", by way of the Old French femelle . It is not etymologically related to the word male , but in
1763-471: The same size). The exact mechanism of female gamete evolution remains unknown. In species that have males and females, sex-determination may be based on either sex chromosomes , or environmental conditions. Most female mammals , including female humans , have two X chromosomes . Characteristics of organisms with a female sex vary between different species, having different female reproductive systems , with some species showing characteristics secondary to
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1806-548: The therians; as fossils of all three genera are dated about 167 million years ago in the Middle Jurassic , this is a reasonable estimate for the appearance of the crown group. T. S. Kemp has provided a more traditional definition: " Synapsids that possess a dentary – squamosal jaw articulation and occlusion between upper and lower molars with a transverse component to the movement" or, equivalently in Kemp's view,
1849-573: The word female as a noun was considered more respectful than calling her a woman or a lady and was preferred for that reason; however, by 1895, the linguistic fashion had changed, and female was often considered disparaging, usually on the grounds that it grouped humans with other animals. In the 21st century, the noun female is primarily used to describe non-human animals, to refer to biologically female humans in an impersonal technical context (e.g., "Females were more likely than males to develop an autoimmune disease"), or to impartially include
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