Principle Of Inheritance And Variation Question 375
Question: Mary’s father has haemophilia but her husband is also haemophilic. What would be the chance other daughter having this disease?
Options:
A) 0%
B) 50%
C) 100%
D) 25%
Show Answer
Answer:
Correct Answer: B
Solution:
Mary is a carrier of hemophilia $(X^HX^h)$, as her father has hemophilia $(X^hY)$. Her husband is hemophilic $(X^hY)$. There’s a 50% chance their daughter will inherit the hemophilic allele from both parents $(X^hX^h)$, making her hemophilic too. Thus, the chance of their daughter having hemophilia is 50% (option B).
BETA
