Sex chat n o 2015

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Sexual reproduction involves the combining and mixing of genetic traits: specialized cells known as gametes combine to form offspring that inherit traits from each parent.

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Many species, both plants and animals, have sexual specialization, and their populations are divided into male and female individuals.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.However, no third gamete type is known in multicellular plants or animals.the origin of chromosomal sex determination may have been fairly early in eukaryotes (see Evolution of anisogamy).

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