Barr body in mammals represents

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(B) In mammals,if there is more than one $X$-chromosome,one $X$-chromosome remains active,while the other becomes inactive and highly condensed to for

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

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(B) In mammals,if there is more than one $X$-chromosome,one $X$-chromosome remains active,while the other becomes inactive and highly condensed to form a structure known as the Barr body.Barr body is a type of sex chromatin particle.It serves as a sex marker and its number is always one less than the total number of $X$-chromosomes present in the cell (i.e.,$n-1$ rule,where $n$ is the number of $X$-chromosomes).

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