Question

Count the baby's fingers. His parents both have five fingers on each hand. Six fingers is a dominant trait. Is it possible for this baby to be with the correct parents? Or do we need to take it back to the hospital to find it's real parents? Defend your answer by providing at least two facts to support your claim.

Answer 1

Being born with six fingers is actually a dominant trait and the probability of the children would be 75% with six fingers and 25% with five fingers if both parents were heterozygous for that trait. If both parents were homozygous dominant for that trait then there is a 100% probability of the children being born with six fingers.