George has blue eyes, but both his parents have brown eyes. How can this be?

Name: George has blue eyes, but both his parents have brown eyes. How can this be?
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Question

Quizplus · Accepted Answer

Each parent must have carried a recessive gene for blue eyes. Brown is a dominant eye color, meaning that a person only needs one brown allele to have brown eyes. Blue eyes are recessive, so an individual needs two blue alleles to have blue eyes. If George has blue eyes, each of his parents must have contributed a recessive blue allele.

George Has Blue Eyes, but Both His Parents Have Brown