Barr body in mammals represents

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Question

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

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

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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.

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