4th December 2019

kqed
18

Why is the dominant trait not always the most common?

This isn't always the case and there is no reason it should be. Whether or not a trait is common has to do with how many copies of that gene version (or allele) are in the population. It has little or nothing to do with whether the trait is dominant or recessive. Let's take eye color as an example.

Keeping this in consideration, is a cleft chin a dominant trait?

This is an inherited trait in humans, where the dominant gene causes the cleft chin, while the recessive genotype presents without a cleft. However, it is also a classic example for variable penetrance with environmental factors or a modifier gene possibly affecting the phenotypical expression of the actual genotype.
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