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Q. Number of Barr bodies in XXXX female is

AIPMTAIPMT 2001Principles of Inheritance and Variation

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.