question_answer

The female children of haemophilic father and carrier mother:

A)  all haemophilic

B)  half haemophilic, half carrier

C)  all normal

D)  all carrier

Correct Answer: B

Solution :

 Haemophilia is a X-linked recessive disease in  human. The affected person lacks a normal blood clotting substance thromboplastin. So, half the daughter are haemophilic whereas other half are carrier.