MHT CET Biology question

One child is haemophilic (sex-linked trait), while its fraternal twins brother is normal, which one of the following information is most appropriate?

(A)Haemophilic child is male
(B)The other child is female and the father is haemophilic
(C)Child is monozygotic twin
(D)The mother must have been heterozygousCorrect

Answer: (D)

Solution

The normal brother received an from the mother and the haemophilic child (son or daughter) must have received an from her, so she must be heterozygous; the

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Question ID VK-059558