Evan and Janet have normal skin pigmentation, but they have a daughter with albinism, a lack of pigmentation. Evan and Janet from problem 1 decide to have another child. It is a boy whose skin pigmentation is normal, but he suffers from galactosemia, a recessive disorder that both parents do not suffer from. Juan has six fingers on each hand and six toes on each foot. His wife Alicia and their daughter Maria have the normal number of digits.
Extra digits is a dominant trait.
A brown mouse is repeatedly mated with a white mouse and all their offspring are brown. Tim and Carolyn both have freckles but their son Michael does not. Show how this is possible. Both Tim and Carolyn from the previous problem have a widow's peak. But Michael has a straight hair line.