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Both Parents Are Heterozygous for Tay-Sachs Disease (An Autosomal Recessive

Question 34

Multiple Choice

Both parents are heterozygous for Tay-Sachs disease (an autosomal recessive disorder) . Three children in a row were born with Tay-Sachs disease. What is the chance that a fourth child will have Tay-Sachs disease?


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

Correct Answer:

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