The human allele that causes six fingers per hand is dominant over the allele that produces five fingers per hand, yet most humans have five fingers per hand. Why is this so?

Question

Quizplus · Accepted Answer

The six-finger allele exists at a low frequency in the human population. Even though the six-finger allele is dominant over the five-finger allele, it exists at a low frequency in the human population, and most individuals carry two copies of the five-finger allele, which results in the expression of the five-finger trait. Therefore, the majority of humans have five fingers per hand.

The Human Allele That Causes Six Fingers Per Hand Is