Parents who both have brown eyes, but carry genes for blue eyes

Question

Quizplus · Accepted Answer

Brown eyes are typically dominant over blue eyes, meaning that if both parents carry the gene for blue eyes (recessive) in addition to the gene for brown eyes (dominant), they can produce a child with blue eyes if the child inherits the recessive gene from both parents. The genetic probability for such a scenario, assuming simple Mendelian inheritance, is that there is a 3:1 ratio favoring brown eyes over blue eyes. This means for every four children, on average, three would have brown eyes and one would have blue eyes, assuming each parent carries one brown eye gene (dominant) and one blue eye gene (recessive).

Parents Who Both Have Brown Eyes, but Carry Genes for Blue