Question

Of a normal couple, half the sons are haemophilic while half the daughters are carriers. The gene is located on(a) X-chromosome of father(b) Y-chromosome of father(c) one X-chromosome of mother(d) both the X-chromosomes of mother

Answer 1

X chromosome of the mother

Answer 2

one x chromosome of mother because question given is about 'normal couple' the mother must be a carrier.