In a female human cell, what would be the effect on X inactivation if a mutation occurred in the Xist gene making it nonfunctional?
A. Both of the X chromosomes would become inactivated.
B. Only the paternal X chromosome would become inactivated.
C. Only the maternal X chromosome would become inactivated.
D. Neither of the X chromosomes would become inactivated.
E. One of the two X chromosomes would become inactivated.
Ans: D. Neither of the X chromosomes would become inactivated.
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