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Barring rare medical conditions, most female mammalsincluding female humanshave two X chromosomes.

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Female characteristics vary between different species with some species containing more well defined famele characteristics. Both genetics and environment shape the prenatal development of a female. The ova are defined as the larger gametes in a heterogamous reproduction systemwhile the smaller, usually motile gamete, the spermatozoonis produced by the male. A female individual cannot reproduce sexually without access to the gametes of a male, and vice versa. Some organisms can also reproduce by themselves in a process known as asexual reproduction.

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An example of asexual reproduction that some female species can perform is parthenogenesis. There is no single genetic mechanism behind sex differences in different species and the existence of two sexes seems to have evolved multiple times independently in different evolutionary lineages.

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 famele another. The concept is not limited to animals; egg cells are produced by chytridsdiatomswater moulds and land plantsamong 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.

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The word female comes from xxx Latin femellathe diminutive form of feminameaning " woman ". It is not exploited teen porn tube related to the word malebut xxx the late 14th century the spelling was altered in English to parallel the spelling of male.

A distinguishing characteristic of the class Mammalia is the presence of mammary glands. The mammary glands are modified sweat glands that produce milk, which is used to feed the young for some time after birth.

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Only mammals produce milk. Mammary glands are most obvious in xxxas 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 seldom used by the males of the species. Most mammalian females have two copies of the X chromosome as opposed to the male which carries only one X and one smaller Y chromosome but some mammals, such as famele platypushave different combinations.

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To compensate for the difference in size, 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 whilst the male carries two Z chromosomes. However, these conditions frequently result in sterility.