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the origin of chromosomal sex determination may have been fairly early in eukaryotes (see Evolution of anisogamy).The ZW sex-determination system is shared by birds, some fish and some crustaceans.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.

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the malaria parasite) also engage in sexual reproduction.

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Multiplicity of gamete types within a species would still be considered a form of sexual reproduction.

However, no third gamete is known in multicellular animals.

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