A) Inactivation of paternal X chromosome
B) Inactivation of maternal X chromosome
C) Inactivation of both X chromosomes
D) Inactivation of either the paternal or maternal X chromosome
Correct Answer: D
Solution :
According to the principle of dosage compensation, one of the two X chromosomes in a female are inactivated at random. The inactive X chromosome appears as the Barr body. Hence, the correct option is (d).
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