Cystic fibrosis is a fatal lung condition that results from a recessive gene. If one parent is a healthy carrier for the condition while the other is not a carrier,what is the likely outcome for any children they might have?
A)The children will be heterozygous for cystic fibrosis, and all will develop the disease.
B)Fifty percent of their children will develop the disease, and the other fifty percent will be carriers.
C)None of the children will have the disease, and none will be carriers.
D)None of the children will have the disease, but they have a fifty percent chance of becoming carriers.

Question

Cystic fibrosis is a fatal lung condition that results from a recessive gene. If one parent is a healthy carrier for the condition while the other is not a carrier,what is the likely outcome for any children they might have?​ 
A)The children will be heterozygous for cystic fibrosis, and all will develop the disease. 
B)Fifty percent of their children will develop the disease, and the other fifty percent will be carriers. 
C)None of the children will have the disease, and none will be carriers. 
D)None of the children will have the disease, but they have a fifty percent chance of becoming carriers.

Quizplus · Accepted Answer

If one parent is a carrier for cystic fibrosis and the other is not, their children will have a 50% chance of inheriting the recessive gene from the carrier parent. If a child inherits the gene, they will be a carrier like their healthy parent. If they do not inherit the gene, they will not have the disease or be a carrier. Therefore, none of the children will have the disease, but they have a 50% chance of inheriting the gene and becoming carriers.

Cystic Fibrosis Is a Fatal Lung Condition That Results from a Recessive