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Question
A haemophilic man marries a carrier woman and they have a daughter. What is the probability of their daughter being haemophilic?
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Solution
50%
Explanation:
A haemophilic male (XhY) and a carrier lady (XXh) have a 50% of probability of conceiving a haemophiliac daughter. This is because one of the two probable daughter genes codes for haemophilia, whereas the other does not. Half of the daughters are carriers and half are hemophilic.
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