If a boy's father has haemophilia and his mother has one gene for haemophilia, what is the chance that the boy will inherit the disease

Options

A. `25%`
B. `50%`
C. `75%`
D. `100%`

Answer

B

Explanation

Change of a body inheriting haemophilin soley depends upon the mother's nature irrespective of his father's nature. If mother is heterozygous for disease, chances are `50%` and if she is heterozygous similarly, them all this sons will inherit the disease.