Father of a child is haemophilic and the mother is a carrier for the defective gene, the probability of the child having haemophilia is
A
25%
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B
50%
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C
75%
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D
100%
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Solution
The correct option is B50% Male↓/Female→XHXXHXHXHXHXYXHYXY
Out of 4 children 1 son and 1 daughter would be haemophilic, 1 daughter can be a carrier and 1 son completely normal. So 2 out of 4 children are haemophilic. Hence the probability is 50%.