u/Ecstatic-Climate-898

I have a question about hair color dominance within the universe. So within the marrige between Alicent and Viserys i they only have blond children together, which would show blond is the dominate hair color in the relationship. But when Daeron the good and Myriah have 4 children, and they have 3 blond kids and one brunette, which would show brunette is dominant over ginger... right? but in the case of the starks eddard only has 5 trueborn childern with Catelyn and 4 of the 5 are ginger ..?????????????? Can someone that actually understands biology beyond a high school understanding explain what hair color is considered dominate.