Fred had a child with cystic fibrosis in a previous marriage. A genetic counselo

Question

Fred had a child with cystic fibrosis in a previous marriage. A genetic counselor recommended that his current wife Ginger, have a genetic test for the mutant CFTR (cystic fibrosis) allele before having their child. Fred and Ginger do not have cystic fibrosis, but test results indicate that Ginger does carry the recessive allele for cystic fibrosis.

a. If we represent F = normal condition, and f = recessive cystic fibrosis allele, what are the genotypes for Fred and Ginger?

Fred ___ ___ Ginger ___ ___

b. What are the possible genotypes that their children could have? Use a Punnett Square to determine your answer.

c. What is the probability of Fred and Ginger having a child with cystic fibrosis?

Explanation / Answer

Fred had a child with cystic fibrosis in a previous marriage. A genetic counselo

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