試題詳解

8. Polydactyly is a dominant trait that results in extra fingers and toes in humans. A man with polydactyly marries a woman with 10 fingers and toes. They have a child that has a normal number of digits. The phenotype of the man's father is unknown, but his mother has a normal phenotype. What are the genotypes of the married couple? (D= polydactyl allele；d = wild type allele)
(A) woman Dd, man dd
(B) woman DD, man dd
(C) woman dd, man DD
(D) woman dd, man Dd
(E) woman DD, man Dd or dd