A) all heterochromatin in female cells
B) all heterochromatin in male and female cells
C) the Y-chromosome in the somatic cells of male
D) one of the two X-chromosomes in somatic cells of female
Correct Answer: D
Solution :
In a normal female, one of the two X- chromosomes becomes heterochromatic and appears as Barr body. This inactivation of one of the two X-chromosomes of a normal female is called dosage compensation or Lyons hypothesis.
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