Question Detail
Question
If a mother is a carrier for haemophilia (an X-linked disorder) and the father has haemophilia, what is the probability that their children will have the disease?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Mother is carrier (XHXh), father has haemophilia (XhY). Possible offspring: XHXh (carrier daughter), XhXh (haemophilic daughter), XHY (normal son), XhY (haemophilic son). So, 2 out of 4 possible offspring (50%) have the disease (haemophilic daughter and haemophilic son).
Hint
Make a Punnett square.