A turner child born to normal parents is haemophilic. Where did the non-disjunction occur?

A turner child born to normal parents is haemophilic. Where did the non-disjunction occur? Correct Answer Father

The only possibility here is that the mother was a carrier. The egg received this defective X chromosome from mother and no sex chromosome from the father. Thus, there was non disjunction in the father. The resultant child was AA+ X’O. (X’=mutant).
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