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The XY sex-determination Bikini ladies Maroubra is the sex-determination system found in humansmost other mammalssome insects Drosophilasome snakes, some fish guppiesand some plants Ginkgo tree. In this system, the sex of an individual is determined by a pair of sex chromosomes.

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Males typically South Brisbane russian show two different kinds of sex chromosomes XYand are called the heterogametic sex.

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Female (XX) mammals inherit one X chromosome.