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Tay-Sachs disease in humans is inherited as an autosomal recessive condition. This disease progressively destroys nerve cells of the central nervous system.

Assume that a couple that are both heterozygous marry and have a child. The child does not have the disease.

What is the chance that the child is heterozygous based on this pedigree information?

A

0%

B

25%

C

67%

D

75%

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