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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.Other animals have a sex-determination system as well, such as the ZW sex-determination system in birds, and the X0 sex-determination system in insects.

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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.

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