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, it exists at a low frequency in the human population. Therefore, the chances of two individuals carrying the six-finger allele coming together to produce offspring that express the trait is relatively low, leading to most humans having five fingers per hand.

The Human Allele That Causes Six Fingers Per Hand Is