Question

After learning that you get your traits from your parents, a student is convinced he is adopted because both of his parents have brown eyes (dominant trait), but he has blue eyes (recessive trait). how it is possible that he is a biological child of his parents?

Answer 1

It is likely his grandparents had blue eyes, if his parents had traits for both and blue is recessive, then there's a 25% one of their children would have blue eyes