genetics&linguistics

Would you put me through with some information about the genetic studies
you have done on different populations in the world, especially on
Northern Europeans. What kind of mutation has caused them to have such a
look as blond hair, blue eyes and white skin? When and where did this
mutation occur? Were the earliest indoeuropean speakers homogeneous like
Northeastern Chinese people? Were pre-indo-european population in
Northern Europe, if there were, identical with the indo-european
conquerors or not? I read a piece of news about Northern European
genetic studies by an Oxford professor named Ryk Ward in 2001. Have you
heard of him?