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spermatozoa, or sperm, in animals; pollen in seed plants) while females produce large gametes (ova, or egg cells).Individual organisms which produce both male and female gametes are termed hermaphroditic.Conversely, there are also species in which there is no sexual specialization, and the same individuals both contain masculine and feminine reproductive organs, and they are called hermaphrodites. The reason for the evolution of sex, and the reason(s) it has survived to the present, are still matters of debate.

The resulting cells are called gametes, and contain only half the genetic material of the parent cells.For instance, mate choice and sexual selection can accelerate the evolution of physical differences between the sexes.Among humans and other mammals, males typically carry XY chromosomes, whereas females typically carry XX chromosomes, which are a part of the XY sex-determination system.The ZW sex-determination system is shared by birds, some fish and some crustaceans.XY sex determination is used by most mammals, and from a comparison between chicken and human, the Z chromosome appeared similar to the autosomal chromosome 9 in human, rather than X or Y, suggesting that the ZW and XY sex-determination systems do not share an origin, but that the sex chromosomes are derived from autosomal chromosomes of the common ancestor of birds and mammals.

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