If we denote a cystic fibrosis gene with a c and a disease-free gene with a C (since the disease is recessive), then only a cc person will actually have the disease. Such persons would ordinarily die before parenting children, but a child can also inherit the disease from two Cc parents (who themselves are
healthylong dash—that
is, have no symptoms but are "carriers" of the disease).
Suppose a child is born to one cystic fibrosis carrier parent and one non-carrier parent. Find the probability that that the child will
have thehave the
diseasedisease.
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