Genes pop out randomly it seems.
My father’s brother had a son.
My father’s sister had 3 children.
I saw my cousin’s, by my uncle, grandson the other day. Look exactly like my cousins, by my aunt, looked when they were children. This look must have come from the common ancestors which for this child were 4 generations back.
How common are the Genes, if I am Japanese and you are a Limey, for example?