The degree of earlobe attachment in humans is inherited as a simple dominant of free earlobes, or as a recessive allele of attached earlobes. What is the probability that a woman with attached earlobes will have children with attached earlobes if their father has free earlobes, but his father had attached earlobes?
A. 1 in 10
B. 3 in 4
C. 1 in 2
D. none
Answer: C
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