Both Bob and Sally have brown eyes,yet their newborn son has blue eyes.This can happen because
A) all infants have blue eyes that eventually turn brown.
B) each parent was carrying a dominant gene for brown eyes.
C) blue eyes are dominant.
D) each parent was carrying a recessive gene for blue eyes.

Question

Quizplus · Accepted Answer

Both parents must have been carrying a recessive gene for blue eyes. When both parents pass on this recessive gene to their child, it will result in blue eyes. The explanation in choice A is incorrect because not all infants are born with blue eyes, and eye color does not necessarily change from blue to brown. The explanation in choice B is incorrect because if both parents had a dominant gene for brown eyes, their child would also have brown eyes. The explanation in choice C is incorrect because blue eyes are actually recessive in inheritance.

Both Bob and Sally Have Brown Eyes,yet Their Newborn Son