Are "white genes" really not dominant at all?

don't even know if there's such thing as "white genes". I have 9 half white (European) half Tunisian cousins (that I know of) and only 2 of them look like me (same hair, eyes and skin color combinations) the other 7 are all blonde, white and have blue or green eyes and look European. Ps: light eyes and hair are present in my family but they are usually combined with average olive/tanned skin tone like mine. So are white genes really not that dominant? I read on Gag a guy saying that intermarriage is genetic sucide for the white "race".
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Dominant *
Are "white genes" really not dominant at all?
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