Describe the mechanism of race formation.

Well, let’s take for example gene A – which is responsible for curly hair, gene a – for straight hair, gene B – for yellowness of the skin, b – for its whiteness.
I will designate a woman as ♠, and a man as ♦, because I don’t know how to put signs here huh.
R: ♠ AABb × ♦ aabb
G: AB ab ab
F1: AaBb Aabb, as we see, the children turned out to be completely different in genotype, so the mixing of genes gives rise to races