system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do babies of one dark skinned parent and one light skinned parent, land in the middle generally? Is skin color not a dominant/recessive thing?

I’ll try my best to elaborate: if you have a blue eyed parent and a brown eyed parent, you aren’t born with blue-brown eyes generally. Or if one is blonde and one is darker haired, obviously the dominant gene shows up. So how does melanin mix and create a child with skin somewhere in the middle between the parents? I guess it’s hard for me to understand  skin is neither dominant nor recessive and how a mixed child is neither fair nor dark. I don’t know if this makes any sense lol. I have a white dad and black mum so I’m brown, and don’t get how my dna determines to make me brown instead of black or white.
gpt
There is no single gene for skin color. There are multiple genes that encourage production of eumelanin. Multiple genes that encourage production of pheomelanin. Genes that inhibit eumelanin. Genes that influence how melanin-producing cells are distributed throughout the body. Genes that influence melanin precursors. All of these genes interact with each other.

The whole dominant/recessive thing, a simplification in the first place, just does not work when you are talking about complexity on that scale.