WAEC Biology 2013 Objective — Question 54
Question 54 of 60 from the West African Examinations Council (WAEC) Biology 2013 Objective paper, with the correct answer and a full explanation.
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A man who suffers from haemophilia marries a woman who is a carrier, what percentage of their children are likely to be haemophilic?
- A. 25%
- B. 50%Correct
- C. 75%
- D. 100%
Explanation
As explained in the related genetics question on incompatibility of Rhesus factor between an intending couple leading to still-births, using the cross for haemophilia carriers, 50% of the children are expected to be affected (note that females will only suffer from the disease when both X-chromosomes are affected).
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