Pediatrics The first child of a normal couple was diagnosed to have cystic fibrosis. What is the percentage of the chances for the second child to be affected? A 50% B 0% C 25% D 100% 💡 Explanation The first child of a normal couple was diagnosed to have cystic fibrosis. What is the percentage of the chances for the second child to be affected? ✓ Correct Answer: C. 25%