Eli5 : Why do some genes (like skin color) mix and shade upon inheritance while some don’t (like eye color) ?
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Skin color is controlled by a large number (I believe unknown) of genes and can average out. Eye color is [more narrowly controlled by fewer genes](https://medlineplus.gov/genetics/understanding/traits/eyecolor/). But like skin tone, the amount of melanin your body produces determines how dark your eyes are, and to have blue or green colors be visible, you need to be pretty damn light on melanin. But even of those who have brown eyes, there is [variety of just how dark it is.](https://www.google.com/search?q=variety+of+brown+eyes).
(IE, your premise is wrong, eye color does mix and shade)
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