A man has extra digits (six fingers on each hand and six toes on each foot).His wife and their daughter have a normal number of digits.Having extra digits is a dominant trait.The couple's second child has extra digits.What is the probability that their next (third)child will have extra digits?

Question

Quizplus · Accepted Answer

The man is heterozygous for the trait (Dd) since he has extra digits (dominant trait) and his wife is homozygous recessive (dd) since she has a normal number of digits. The probability of their child having extra digits is 1/2, as there is a 50% chance of inheriting the dominant allele (D) from the father.

A Man Has Extra Digits (Six Fingers on Each Hand