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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.[2][3][4]

For other uses, see Female (disambiguation).

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 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 whith a female sex vary between different species, having different female reproductive systems, with some species showing characteristics secondary to 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.[5][6]

species with two or more mating types with gametes of identical form and behavior (but different at the molecular level),

Isogamous

species with gametes of male and female types,

Anisogamous

species, which include humans, in which the female gamete is much larger than the male and has no ability to move. Oogamy is a form of anisogamy.[19] There is an argument that this pattern was driven by the physical constraints on the mechanisms by which two gametes get together as required for sexual reproduction.[20]

Oogamous

Females produce ova, the larger gametes in a heterogamous reproduction system, while the smaller and usually motile gametes, the spermatozoa, are produced by males.[3][17] 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.[18]


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 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.

Girl

Pregnancy

Femininity

Lady