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Question
Probability of a male child of a haemophilic father and a normal mother becoming haemophilic is?
Probability of a male child of a haemophilic father and a normal mother becoming haemophilic is?
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Solution
The correct option is C 0%
Haemophilia is an X-linked recessive disorder. Since the father transmits his X chromosome to the daughters, and not the son, the haemophilic father will not transfer haemophilia to his son. The son receives an X chromosome from the mother which means that the mother should have at least one copy of the affected allele to transmit the disease to her son.
Thus the correct answer is option A.
Haemophilia is an X-linked recessive disorder. Since the father transmits his X chromosome to the daughters, and not the son, the haemophilic father will not transfer haemophilia to his son. The son receives an X chromosome from the mother which means that the mother should have at least one copy of the affected allele to transmit the disease to her son.
Thus the correct answer is option A.
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