It's to do with recessive genes. E.g. Father has one dominant black hair gene and one recssive blonde hair gene, therefore the black hair gene affects and he has black hair. Mother has one dominant brown hair gene and one recessive blonde hair gene, therefore the brown hair gene affects and she has brown hair. The child gets one hair gene at random from each parent. E.g. they could get both blonde hair genes. They are recessive, but there are no dominant genes therefore they still affect, and the child gets blonde hair. This is the rough idea, obviously more than one gene controls hair colour, but it's the same sort of idea.
Is it normal to think I might have other father?
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It's to do with recessive genes. E.g. Father has one dominant black hair gene and one recssive blonde hair gene, therefore the black hair gene affects and he has black hair. Mother has one dominant brown hair gene and one recessive blonde hair gene, therefore the brown hair gene affects and she has brown hair. The child gets one hair gene at random from each parent. E.g. they could get both blonde hair genes. They are recessive, but there are no dominant genes therefore they still affect, and the child gets blonde hair. This is the rough idea, obviously more than one gene controls hair colour, but it's the same sort of idea.