In cells of human individuals with three or more X chromosomes, ____
a. one X chromosome remains active and the others are inactivated
b. all of the X chromosomes remain active
c. two X chromosomes remain active and the others are inactivated
d. two X chromosomes remain active in females and one remains active in males; the rest are inactivated
e. only one X chromosome is inactivated
ANSWER: a
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