males have XY sex chromosomes why females have XX sex chromosomes
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males have XY sex chromosomes why females have XX sex chromosomes
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Answer:
In the XY sex-determination system, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively. Hormone levels in the male parent affect the sex ratio of sperm in humans.