X chromosome inactivation results in the _______________________.
A. total inactivation of both X chromosomes
B. inactivation of only the paternal X chromosome
C. inactivation of only the maternal X chromosome
D. inactivation of either the paternal X chromosome or the maternal X chromosome
E. nonrandom inactivation of X chromosomes in the initial cells of tissues
Answer: D
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What will be an ideal response?