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How is CF inherited?

Cystic fibrosis (CF) affects people who inherit two copies of an altered gene from their carrier parents. Carrier parents have a one-in-four chance of having an affected child, a one-in-two chance of having a child who is an unaffected carrier and a one-in-four chance of having a child who doesn't have the altered gene at all. Carriers of CF are not affected themselves, as they have a working gene as well as an altered one.

Inheritance of cystic fibrosis.
Inheritance of cystic fibrosis.
Corbis

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