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The resulting cells are called gametes, and contain only half the genetic material of the parent cells.

Diploid organisms can, in turn, form haploid cells (gametes) that randomly contain one of each of the chromosome pairs, via meiosis.Life has evolved from simple stages to more complex ones, and so have the reproduction mechanisms.Initially the reproduction was a replicating process that consists in producing new individuals that contain the same genetic information as the original or parent individual.Many species, particularly animals, have sexual specialization, and their populations are divided into male and female individuals.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.

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