A woman heterozygous for the haemophilia gene, marries a man who is normal and they produce a baby boy. What is the probability that the boy would be haemophilic among all the children? A. 0%. B. 25%. C. 33.3%. D. 50%.
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Answer:
25 %
Explanation:
because female is a carrier and for a diseased or haemophilic male the combination of sex chromosome must me X(h) Y .
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