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Do women have more DNA than men?
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[QUOTE="BillTre, post: 6818719, member: 581757"] [URL='https://en.wikipedia.org/wiki/X-inactivation']X-chromosme inactivation[/URL] in mammals happens after many cells have already formed in the developing embryo. Once an X-chromosome is inactivated, it stays that way in all descendant cells. Which chromosome is inactivated is random among the cells in the embryo, so the embryo and the adult that grows from it are a mix of cells with one or the other of its X-chromosomes inactivated. This can lead to [URL='https://en.wikipedia.org/wiki/Mosaic_(genetics)']mosaic genetic effects[/URL] for genes on the X-chromosome. [/QUOTE]
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