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When I blend black and white paint, I always get gray. Why aren't biracial children gray?

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ninalanyon · 61-69, T
Apart from @Anniedlr's point, that simply isn't how gene based inheritance worked. In fact that was the missing piece of data that Darwin didn't have when he wrote the Origin of Species. It wasn't until Mendel's work was rediscovered that it was understod that inheritable traits do not blend. Generally genes are either dominant or recessive (yes I know this is not always true). This means that if you get a dominant gene from either parent then it will be expressed whereas you need to get two copies of a recessive gene for it to be expressed.

For instance red hair is recessive:
[quote]The one that takes precedent is the dominant gene. Red hair is a recessive gene, so your husband has two red hair genes. The only way for your child to have red hair is if you have a recessive red gene (being covered by the dominant brown hair gene) and that is the gene that gets passed onto the baby.[/quote]
https://www.theguardian.com/notesandqueries/query/0,,-194746,00.html