Barr body in mammals represents (1)All the heterochromatin in male and female cells (2)The Y-chromosome in somatic cells of male (3)All the heterochromatin in female cells (4) One of the two X-chromosomes in somatic cells of females
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A Barr body is an inactive X chromosome in the female somatic cell due to the process called lyonization. The Lyon hypothesis states that, in the cell with multiple X chromosomes, all but one are inactivated during mammal embryogenesis. Thus Barr bodies are seen in the female having XX chromosome. It is also seen in chromosomal defects like Klinefelter syndrome having XXY.
Hence correct answer is D.
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Barr body in mammals represents
(1)All the heterochromatin in male and female cells
(2)The Y-chromosome in somatic cells of male
(3)All the heterochromatin in female cells
(4) One of the two X-chromosomes in somatic cells of females ✔✔✔
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