Where did I get my genes?

While you admire your good looks in the mirror, don't forget to thank your parents. Genes come in pairs: one from Mom and the other from Dad. It's the combination of genes that bring about-or "express"-various physical traits (in a process called heredity). Some genes are more influential on your appearance than others. The genes for dark hair are dominant over genes for rd and blond hair, making dark hair more common.