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Why do all the gametes formed in human f...

Why do all the gametes formed in human females have an X chromosome?

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Human cells have 22 pairs of autosomes +1  pair of sex chromosomes. In males, the pair of sex chromosome is heterozygous (XY), while in females, it is homozygous (XX). During gamete formation in reproductive tissue, the homologous chromosomes segregate in such a way that each gamete cell receives one complete set of chromosomes (22+1). The male contributes either X or a Y chromosome to its gametes, while the female contributes X chromosome to all its gametes.
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