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Principles of Inheritance and Variation

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  1. Mental retardation in man associated with sex chromosomal abnormality is usually due to
    1. increase in X complement
    2. moderate increase in Y complement
    3. large increase in Y complement
    4. reduction in X complement
Correct Option: A

Mental retardness is usually found when there are more than two X chromosomes. About 1% of all mentally defective men have one or more extra X chromosomes.


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