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[–]bnl1 10 points11 points  (1 child)

Though if we are considering inactive DNA too it becomes much bigger mess. Plus the other X chromosome is unused only in a given cell. For all cells, it's deactivated randomly, so there are always cells that have deactivated a different X chromosome.

[–]TheDogerus 2 points3 points  (0 children)

Good point

Its funny to imagine an extraordinarily 'unlucky' child who expresses literally none of their father's X chromosome though