Cystic fibrosis is a genetic disorder. It is a recessive trait that is determined by two alleles. Suppose two parents each carry at least one recessive allele, but neither of them has cystic fibrosis. Which statement reflects the likelihood of a child of these parents having cystic fibrosis?

Question

Renee Craig

Biology

29 January, 08:56

Cystic fibrosis is a genetic disorder. It is a recessive trait that is determined by two alleles. Suppose two parents each carry at least one recessive allele, but neither of them has cystic fibrosis. Which statement reflects the likelihood of a child of these parents having cystic fibrosis?

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Hailey Morgan · Answer 1

If the parents carry the disease but are themselves not affected then they are carriers having the genotype Cc each so the offsprings would potentially be:

Cc Cc CC and cc, where Cc and CC are both normal while cc would be affected giving them a 25% chance of producing an affected offspring.