Cathy and Doug both have brown eyes. If their child has blue eyes, what can we conclude about Cathy's and Doug's genes for blue eyes?

Question

Quizplus · Accepted Answer

For a child to have blue eyes, which is a recessive trait, both parents must carry at least one recessive gene for blue eyes. Brown eyes are dominant, so Cathy and Doug can have brown eyes but still carry the recessive blue eye gene.

Cathy and Doug Both Have Brown Eyes