Question

What is the risk that the child of a mother with cystic fibrosis will be a carrier of the disease?

(A) 100%
(B) 75%
(C) 50%
(D) 25%

Answer 1

A child of a mother with cystic fibrosis has a 50% chance of being a carrier of the disease without any symptoms. There is a 25% chance of the child inheriting the disease, and a 25% chance of not being a carrier.

Step-by-step explanation:

According to the Punnett square, if a mother has cystic fibrosis and is a carrier (Ff) of the disease, there is a 50% chance that her child will also be a carrier of the disease (Ff) without any symptoms. The child has a 25% chance of inheriting the disease (ff) and a 25% chance of not being a carrier (FF).