Assume that attached (connected) earlobes are a recessive trait with 73% penetrance. For a P generation where one parent is heterozygous and the other is homozygous recessive for the attached earlobe gene, what is the probability that their first child will have attached earlobes?单项选择题

A

73%

B

50%

C

36.5%

D

18.75%

E

25%

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