Clark's eyes are brown in color. However, both his parents have eyes that are blue in color. According to the dominant-recessive genes principle, the most likely reason for Clark's eyes being brown in color is that
A) Clark's grandparents had brown-colored eyes.
B) Clark has a mutation in his genotype resulting in the change in eye color.
C) Clark's family history shows that the family has a dominant gene for brown-colored eyes.
D) Clark's parents are carriers of genes contributing to brown eyes.

Question

Quizplus · Accepted Answer

According to the dominant-recessive genes principle, brown eye color is a dominant trait while blue eye color is a recessive trait. This means that if both parents have blue eyes, they must have two copies of the recessive gene for blue eyes. Since their child has brown eyes, it is most likely that both parents carry at least one dominant gene for brown eyes, which they have passed down to their child. Therefore, option D is the most likely reason for Clark's eyes being brown in color.

Clark's Eyes Are Brown in Color