Barr body in mammals represents

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4.Principles of Inheritance and Variation

normal

Barr body in mammals represents

All the heterochromatin in female cells

One of the two $X$-chromosomes in somatic cells of females

All the heterochromatin in male and female cells

The $Y$-chromosome in somatic cells of male

Solution

If there are more than one $X$-chromosome then one $X$-chromosome remains active, while the other one becomes inactive and condenses to form Barr body. Barr body is a sex chromatin particle. Barr bodies can be used as a sex marker always occur in numbers one less than the total number of $X$-chromosomes.

Standard 12

Biology