Principles of Inheritance and Variation Question 171
171. Haemophilia is more commonly seen in human males than in human females because: [2005]
(a) a greater proportion of girls die in infancy
(b) this disease is due to a Y-linked recessive mutation
(c) this disease is due to an X-linked recessive mutation
(d) this disease is due to an X-linked dominant mutation
Show Answer
Answer : c
Hints & Solution
(c) This disease is due to an X-linked recessive mutation. Males suffer from this disorder since they have only one X chromosome and hence express any trait on this chromosome.
