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SAT® Subject Test in Biology

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Difficult

PTC-Tasters

SATBIO-UHKV4T

The ability to taste PTC, a bitter chemical, is inherited as an autosomal dominant trait. A woman who is a nontaster has children with a man who is a PTC taster. Their first child is born a nontaster, as is their second child.

What is the probability that their third child will be born a nontaster?

A

0.5

B

0.25

C

0.75

D

0.125

E

0.1666666666666667