Concept explainers
Cystic fibrosis. From the Punnett square in Exercise 39, what is the probability that a child of two carriers will
a. be normal?
b. be a carrier?
Cystic fibrosis. Cystic fibrosis is a serious inherited lung disorder that often causes death in victims during early childhood. Because the gene for this disease is recessive, two apparently healthy adults, called carriers, can have a child with the disease. We will denote the normal gene by N and the cystic fibrosis gene by c to indicate its recessive nature.
a. Construct a Punnett square as we did in Example 9 to describe the genetic possibilities for a child whose two parents are carriers of cystic fibrosis.
b. What is the probability that this child will have the disease?
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