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For instance, mate choice and sexual selection can accelerate the evolution of physical differences between the sexes.

Each cell in the offspring has half the chromosomes of the mother and half of the father.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.Some of the many plausible theories include: that sex creates variation among offspring, sex helps in the spread of advantageous traits, that sex helps in the removal of disadvantageous traits, and that sex facilitates repair of germ-line DNA.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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the malaria parasite) also engage in sexual reproduction.

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