In mammals, X chromosome inactivation results in _____
a. a total inactivation of both female X chromosomes
b. only the inactivation of the paternal X chromosome in females
c. only the inactivation of the maternal X chromosome in females
d. the random inactivation of either the paternal or the maternal X in females
e. the inactivation of the maternal X chromosome in males
ANSWER: d
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Fill in the blank(s) with the appropriate word(s)