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The Pedigree Below Shows the Sex-Linked Recessive Inheritance of Nance-Horan

Question 63

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The pedigree below shows the sex-linked recessive inheritance of Nance-Horan syndrome, a rare Mendelian disorder in which affected persons have cataracts and abnormally shaped teeth. What is the probability that the first child of IV-6 and V-3 would have Nance-Horan syndrome? The pedigree below shows the sex-linked recessive inheritance of Nance-Horan syndrome, a rare Mendelian disorder in which affected persons have cataracts and abnormally shaped teeth. What is the probability that the first child of IV-6 and V-3 would have Nance-Horan syndrome? A) <sup>1</sup>/<sub>4</sub> B) <sup>1</sup>/<sub>2</sub> C) 1/8 D) 3/16 E) <sup>3</sup>/<sub>4</sub>


A) 1/4
B) 1/2
C) 1/8
D) 3/16
E) 3/4

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