Barr body in mammals represents

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(B) The Barr body is a condensed,inactive $X$ chromosome found in the somatic cells of female mammals. According to the Lyon hypothesis,one of the two

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

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(B) The Barr body is a condensed,inactive $X$ chromosome found in the somatic cells of female mammals. According to the Lyon hypothesis,one of the two $X$ chromosomes in female somatic cells undergoes heterochromatinization during early embryonic development. This inactive $X$ chromosome appears as a deeply stained,dense body near the nuclear envelope,known as the Barr body. Therefore,the correct answer is $B$.

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