Ryan has cystic fibrosis. This means that his mother is a carrier for the cystic fibrosis gene, while his father ________.
A) is also a carrier
B) is not a carrier
C) does not have a cystic fibrosis gene
D) has two cystic fibrosis genes

Question

Ryan has cystic fibrosis. This means that his mother is a carrier for the cystic fibrosis gene, while his father ________.
A) is also a carrier 
B) is not a carrier 
C) does not have a cystic fibrosis gene
D) has two cystic fibrosis genes

Quizplus · Accepted Answer

Cystic fibrosis is an autosomal recessive disorder, meaning Ryan must inherit one defective gene from each parent. Therefore, his father must also be a carrier.

Ryan Has Cystic Fibrosis