How is that Ashkenazi Jews can have blond hair?

Ashkenazi jews trace their lineage to the middle east and a semitic, afro-asiatic heritage. Ethnically these groups have black or very dark brown hair. Knowing that Ashkenazi jews did not normally marry out of faith, and that blond hair is a recessive very indo-european trait; how can Ashkenazi jews have blonde hair? Was their ethnic mixing, mutations in genes or what?

How is that Ashkenazi Jews can have blond hair?

why does it matter? Is there a book somewhere that says Ashkenazi Jews MUST have black or dark brown hair, or they are not really Jews?

How is that Ashkenazi Jews can have blond hair?

Blond hair can be found in almost any race.

So, what's the point??

How is that Ashkenazi Jews can have blond hair?

Huh? Yes, what does it matter?