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A 39-year-old member asked:

What are the chances of inheriting cystic fibrosis if one's parent has the trait?

2 doctor answers5 doctors weighed in
Dr. David Escobar
Dr. David Escobaranswered
Family Medicine 10 years experience
Depends on Both: This depends on whether both parents carry the trait. If only one parent is a carrier of the gene, then there is no chance of inheriting cystic fibrosis. However, if both parents carry the CF gene, then there is a 25% chance their child will inherit cystic fibrosis.
Dr. James Ferguson
Pediatrics 47 years experience
Like hitting lottery: The only way that would happen would be for the baby to get a defective gene from the carrier(50%) and to have a spontaneous mutation from the other parents gene (

Similar questions

A 42-year-old member asked:

What are the chances of inheriting cystic fibrosis if one parent has trait?

3 doctor answers6 doctors weighed in
Dr. David Escobar
Dr. David Escobaranswered
Family Medicine 10 years experience
Zero: In order for any possibility of a child acquiring cystic fibrosis (cf), both biological parents would have to have the CF trait as carriers. CF is known as an autosomal recessive disease, which means both parents have to be carriers in order for their child to possibly acquire the disease. In these cases, when both parents are carriers, there is a 25% chance the child will acquire cf.

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Last updated Oct 22, 2015

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