Principles of Inheritance and Variation Question 203

203. Of a normal couple, half the sons are haemophilic while half the daughters are carriers. The gene is located on

[1993]

(a) X-chromosome of father

(b) Y-chromosome of father

(c) one X-chromosome of mother

(d) both the X-chromosomes of mother

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Answer : c

Hints & Solution

(c) Since half the sons are haemophilic so the genes for haemophilia is located on $X$ chromosome of mother.