Principles of Inheritance and Variation Question 132

132. Barr body in mammals represents

[1995]

(a) all the heterochromatin in female cells

(b) Y-chromosomes in somatic cells of male

(c) all heterochromatin in male and female cells

(d) one of the two X-chromosomes in somatic cells of females

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Answer : d

Hints & Solution

(d) A Barr body is one of the $X$ chromosomes in somatic cells of females. If there are more $X$ chromosomes then there will be more Barr bodies.