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NEET Biology Principle Of Inheritance And Variation Question Bank Sex Linked Inheritance

  • question_answer
    If a boy's father has haemophilia and his mother has one gene for haemophilia; what is the chance that the boy will inherit the disease [CPMT 1980, 2000; DPMT 1992; AIIMS 1999; Pb. PMT 1999]

    A) 25%

    B) 50%

    C) 75%

    D) 100%

    Correct Answer: B

    Solution :

    Chance of a boy inheriting haemophilia solely depends upon the mother's nature irrespective of his father's nature. If mother is heterozygous for disease, chances are 50% and if she is homozygous similarly, then all his sons will inherit the disease.


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