The Lyon hypothesis deals with:

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(D) The Lyon hypothesis,proposed by Mary Lyon,states that in female mammals,one of the two $X$ chromosomes in each somatic cell is randomly inactivate

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Number of Barr bodies

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(D) The Lyon hypothesis,proposed by Mary Lyon,states that in female mammals,one of the two $X$ chromosomes in each somatic cell is randomly inactivated during early embryonic development.This inactivated $X$ chromosome becomes highly condensed and is visible as a dense,dark-staining body in the nucleus,known as a Barr body.Therefore,the Lyon hypothesis explains the mechanism of dosage compensation in mammals by relating the number of $X$ chromosomes to the number of Barr bodies present in the cell.

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