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The mirror of the Roman Goddess Venus is often used to represent the female sex.

For other uses, see Female (disambiguation).

Female is the sex of an organism, or a part of an organism, which produces ova (egg cells). The ova are defined as the larger gametes in a heterogamous reproduction system, while the smaller, usually motile gamete, the spermatozoon is produced by the male. A female individual cannot reproduce sexually without access to the gametes of a male. Some organisms can reproduce both sexually and asexually.

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 in another. The concept is not limited to animals; egg cells are produced by chytrids, diatoms, water molds, 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.

Contents

  • 1 Sex determination
    • 1.1 Genetic determination
    • 1.2 Environmental determination
  • 2 Mammalian female
    • 2.1 Human female
  • 3 Symbols
  • 4 See also

Sex determination

Main article: Sex-determination system

The sex of a particular organism may be determined by a number of factors. These may be genetic or environmental, or may naturally change during the course of an organism's life. Although most species with male and female sexes have individuals that are either male or female, hermaphroditic animals have both male and female reproductive organs.

Genetic determination

Most mammals, including humans, are genetically determined as such by the XY sex-determination system where males have an XY (as opposed to XX) sex chromosome. During reproduction, a male can give either an X sperm or a Y sperm, while a female can only give an X egg. A Y sperm and an X egg produce a boy, while an X sperm and an X egg produce a girl. The WZ sex-determination system, where males have a ZZ (as opposed to WZ) sex chromosome may be found in birds and some insects and other organisms. Members of Hymenoptera, such as ants and bees, are determined by haplodiploidy, where most males are haploid and females and some sterile males are diploid.

Environmental determination

In some species of reptiles, including alligators, sex is determined by the temperature at which the egg is incubated. Other species, such as some snails, practice sex change: adults start out male, then become female. In tropical clown fish, the dominant individual in a group becomes female while the other ones are male.

In some arthropods, sex is determined by infection. Bacteria of the genus Wolbachia alter their sex; some species consist entirely of ZZ individuals, with sex determined by the presence of Wolbachia.

Mammalian female

The mammalian female is characterised by having two copies of the X chromosome as opposed to the male which carries only one X and one smaller Y chromosome. To compensate for the difference in size one of the female's X chromosomes is randomly inactivated in each cell. Conversely in birds it is the female who is heterozygote and carries a Z and a W chromosome whilst the male carries two Z chromosomes.

Human female

In humans, there are several different components (in addition to genetics) to both biological sex and gender identity by which people assign the label "female".

Symbols

A common symbol used to represent the female gender is ♀ (Unicode: U+2640), a circle with a small cross underneath. This symbol also represents the planet Venus and is a stylized representation of the goddess Venus' hand mirror.

See also

  • Feminine side
  • Male
  • Sex-determination system
  • Woman and girl, female humans
  • Mammal
  • Hermaphrodite
  • Secondary sex characteristic
  • Gestation
Look up Female in Wiktionary, the free dictionary

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "female".