For couples in which both individuals carry one defective CF gene, any offspring from the couple has a ________ percent chance of inheriting two abnormal genes and developing cystic fibrosis.
A)100
B)75
C)50
D)25

Question

Quizplus · Accepted Answer

A)When both parents are carriers of the CF gene, each conception allows for a 25% possibility that two abnormal genes will be passed to the child, along with a 50% possibility that the child will be a carrier of one CF gene. Each conception also allows for a 25% possibility that the child will not carry the CF gene.
B)When both parents are carriers of the CF gene, each conception allows for a 25% possibility that two abnormal genes will be passed to the child, along with a 50% possibility that the child will be a carrier of one CF gene. Each conception also allows for a 25% possibility that the child will not carry the CF gene.
C)When both parents are carriers of the CF gene, each conception allows for a 25% possibility that two abnormal genes will be passed to the child, along with a 50% possibility that the child will be a carrier of one CF gene. Each conception also allows for a 25% possibility that the child will not carry the CF gene.
D)When both parents are carriers of the CF gene, each conception allows for a 25% possibility that two abnormal genes will be passed to the child, along with a 50% possibility that the child will be a carrier of one CF gene. Each conception also allows for a 25% possibility that the child will not carry the CF gene.

For Couples in Which Both Individuals Carry One Defective CF