Question
Biology Question on Principles of Inheritance and Variation
Barr body of a mammal represents
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
Answer
one of the two X-chromosomes in somatic cells of female
Explanation
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.