Principle-Of-Inheritance-And-Variation Question 636
Question: 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 [CPMT 1980, 2000; DPMT 1992; AIIMS 1999; Pb. PMT 1999]
Options:
A) 25%
B) 50%
C) 75%
D) 100%
Show Answer
Answer:
Correct Answer: B
Solution:
Chance of a boy inheriting haemophilia solely 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 homozygous similarly, then all his sons will inherit the disease.
BETA
