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Question

If a boy's father has haemophilia and mother is heterozygous, what is the chance that the boys will inherit haemophilia.

A
50%
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B
25%
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C
75%
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D
100%
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Solution

The correct option is A 50%
Father's chromosomes will be XhY whereas mother's chromosomes will be XhX (heterozygous). Their male offspring will have either XhY or XY chromosomes.Hence, there is a 50-50 chance of boy being haemophilic.

So, the correct answer is '50%'.

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