In the somatic cell of a mammalian female, one of the two x chromosomes is randomly inactivated and condensed, resulting in the formation of a.

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08-11-2022
Biology

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In the somatic cell of a mammalian female, one of the two x chromosomes is randomly inactivated and condensed, resulting in the formation of a.

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NGireesh NGireesh · Answer 1 · 2022-11-12T04:20:32-05:00

In the somatic cell of a mammalian female, one of the two x chromosomes is randomly inactivated and condensed, resulting in the formation of a Barr body

What is Barr body?

Male mammals are homogametic (XY), while female mammals are heterogametic (XY) (XX). Therefore, it would be reasonable to assume that females have a "double dose" of X chromosome gene products. In females, dosage compensation is accomplished by randomly inactivating one of the two X chromosomes. Females [right] and men [left] lack the darkly stained body connected to the nuclear membrane that is the heterochromosome X chromosome.

The heterochromatin X chromosomes are now known as Barr Bodies after Canadian cytogeneticist Dr. Murray L. Barr, who first saw the phenomena in cats, first characterized it. [The nucleoli, or other dark structures inside the nucleus, stand for repeated rDNA genes]

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