A man has six fingers on each hand and six toes on each foot. his wife and their daughter have the normal number of digits. we know that extra digits is an autosomal dominant trait. what fraction of this couple's children would be expected to have extra digits?

The correct answer is 1/2 or one-half.

Since the father has additional fingers and toes, he is likely to pass it down to his daughter or son, whereas their mother is normal, which does not have any abnormalities in the number of toes and fingers, which is why their offspring has 1/2 chance that he or she may acquire his or her father's trait.