Question
Biology Question on Principles of Inheritance and Variation
Number of Barr bodies in XXXX female is
A
1
B
2
C
3
D
4
Answer
3
Explanation
Solution
Barr body is a mass of condensed sex chromatin in the nuclei of normal female somatic cells due to inactive X chromosome. Thus Barr body represents the inactivated X-chromosome. Whenever the number of X-chromosomes is two or more than two, the number of barr bodies is one less than the number of X-chromosomes. Therefore, the number of barr bodies in XXXX female is three.