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Principles of Inheritance and Variation

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  1. Barr body in human female is formed by
    1. inactivation of paternal X-chromosome
    2. inactivation of maternal X-chromosome
    3. inactivation of both X-chromosomes
    4. inactivation of either the paternal or maternal X-chromosome
Correct Option: D

According to the principle of dosage compensation, one of the two X chromosomes in a female are inactivated at random. The inactivate X chromosome appears as the barr body.


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