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  4. Of a normal couple, half the sons arc haemophiliac while half the daughters are carriers. The gene is located on

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Q. Of a normal couple, half the sons arc haemophiliac while half the daughters are carriers. The gene is located on

AIPMTAIPMT 1993Principles of Inheritance and Variation

Solution:

Of a normal couple, half the sons are haemophilic while half the daughters are carries. The gene is located on one X-chromosomes of mother. Cross between a haemophilic carrier female XhX and normal male would yield 50% of the sons being haemophilic and 50% of the daughter are carriers.