Explanation

• A Barr body is a densely staining body found in the interphase nuclei of somatic cells of female mammals, including humans.
• It is a condensed, inactivated X chromosome, which is one of the two X chromosomes present in the nuclei of female cells.
• The Barr body is a result of X-chromosome inactivation, a process that occurs in female mammals to avoid a doubling of gene expression.