system
Given the following post, respond as if you're commenting on Reddit:
human
Sexual Reproduction and Race?

When a mom or dad of two different races have sex (lets say white and black). Why is the product a "mixed" skin color, and not just black or white?
gpt
In order to have something like "black" or "white" only, it would mean that the genes for skin color, hair color, or other features you associate with "white" and "black" are specific to that race. They're not. Genes for skin color are more complicated, and they represent a whole range of possible tones and completions. Lets put it this way: genes aren't like on/off switches. Many are more like a volume knob, with many possible settings. Actually, more than one knob that all combine their settings to make up each person's unique genes. People from a specific part of the world might all have their "skin color gene knobs" turned towards the darker side or the lighter side. You mix the genes from someone with different settings and the kids will end up with something in between. There are also "dominant" genes. That is, genes that overpower other genes almost always. Brown eyes win over blue, usually, for example.