Lyon hypothesis deals with:

Centromere position

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Genetic compatibility

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Genetic incompatibility

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Number of Barr bodies

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Solution

The correct option is D Number of Barr bodies
Lyon hypothesis states that gene dosage imbalance between males and females, because of the presence of two chromosomes in female (XX) as opposed to only in one male (XY), is compensated for by random inactivation of one of the X chromosomes in the somatic cells of females.
The inactivated X chromosome becomes the barr body.
Hence, the correct answer is option D.

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