A man with polydactyly (an extra finger on his hand) marries a normal woman. They have 5 boys and all with polydactyly.

A man with polydactyly (an extra finger on his hand) marries a normal woman. They have 5 boys and all with polydactyly. Some of them subsequently marry normal women and have many children.
a) What is the probability of having children with extra fingers?
b) Describe the man’s genotype in words.
c) Describe the woman’s genotype in words.
d) Describe in words the genotype of the five boys.
e) Is it possible to unambiguously determine the genotype of any person with an extra finger?
f) If both spouses have this defect, then how likely are they to have normal children?

Answer: 50% / house.homozygote / re.homozygote / heterozygote / no / 25%.

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