People move around. So it's not shocking that there are "white" genes in Central Asia and the Middle East. Non-brown hair and eye colors showing through are a hallmark of whiteness, whatever actual skin tone someone ends up having. You don't see it in, eg SE Asia or sub-Saharan Africa. The lightness of people's skin, provided they sit still long enough, tends to be determined by latitude and is a different thing than the hue of their skin. Thus Greeks who are of the Caucasian broad-racial-category have pretty dark skin but carry genes for things like blue eyes. American Indians from that latitude have pretty dark skin, too, but are of a different hue.