When a light skinned person and a dark skinned person have a child, that child is likely to have a mix of those skin tones, resulting in a caramel hue. However, when someone with blond hair and someone with black hair have a child, the child would either have blond or black hair rather than a mix of the two producing brown.
And where do eye colour genes fall in here?
In: Biology
Gene regulation also plays a part in this. Genes can be turned up and down like the volume in a speaker, and this regulation is done by other genes. For example, maybe 2 siblings inherit the same gene A from one of their parents, but sibling 1 also had gene B that amps up expression of gene A, whereas sibling 2 got gene b that doesn’t. This means that the A characteristic will be stronger in sibling 1 and not sibling 2.
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