Question
Biology Question on Principles of Inheritance and Variation
Haemophilic man marries a normal woman. Their offsprings will be
A
all haemophilic
B
all boys haemophilic
C
all girls haemophilic
D
all normal.
Answer
all normal.
Explanation
Solution
Haemophilia is a defect of blood which prevents its clotting. It is caused by a recessive gene located in the X-chromosome. When a haemophilic man (XhY) marries a normal woman (XX), produces carrier girls (XXh) and normal boys (XY), i.e. all their offsprings will be normal.