Eli5 : Why do some genes (like skin color) mix and shade upon inheritance while some don’t (like eye color) ?

Question

Eli5 : Why do some genes (like skin color) mix and shade upon inheritance while some don’t (like eye color) ?

In: 455

Answer 1

We simplify gene expression pretty significant in biology using Punnet squares. It’s almost never one specific gene that’s required for traits to appear the way they do. One gene dictates the amount of melanin in your iris, but the shape and other factors also matter for determining colour.