Question

Haemophilia is more common in males because it is a (a) recessive character carried by Y-chromosome...

Haemophilia is more common in males because it is a

(a) recessive character carried by Y-chromosome

(b) dominant character carried by Y-chromosome

(c) dominant trait carried by X-chromosome

(d) recessive trait carried by X-chromosome.

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Answer #1

Answer: (d) recessive trait carried by X-chromosome.

The males are more affected because they have only one X chromosome. In females, if one X chromosome has a mutation causing haemophilia but another X has no mutation then it can produce the necessary clotting factors (i.e.factor VIII and IX). And they can cancel the effect of hemophilic mutation of the first X chromosome.

But there is no other X in males to produce clotting factors. So males are more affected.

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