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Gametes can be identical in form and function (known as isogamy), but in many cases an asymmetry has evolved such that two sex-specific types of gametes (heterogametes) exist (known as anisogamy).
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.
One of the basic properties of life is reproduction, the capacity to generate new individuals, and sex is an aspect of this process.
Life has evolved from simple stages to more complex ones, and so have the reproduction mechanisms.
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