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Two Parents Heterozygous for Cystic Fibrosis Have a Child with the Disease

Question 20

Multiple Choice

Two parents heterozygous for cystic fibrosis have a child with the disease. The parents are expecting a second child. What is the probability that the second child will also have cystic fibrosis?


A) 100% probability
B) 75% probability
C) 50% probability
D) 25% probability
E) 0% probability

Correct Answer:

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