I know what you're getting at jno but, I'm no expert on this, I can't remember who, maybe jomifl and Birdie, have spoken about the various hominids found around the planet. There was believed to be interbreeding between homo sapiens and neanderthals and, perhaps amongst the others also.
Homo sapiens supposedly came to Europe from Africa at least 50,000 years ago which is a hell of a long time to mess about with the different individual characteristics that come though mutations. A hell of a lot longer than 6000 years or thereabouts!
Here's a the wiki link on it all though,
http://en.wikipedia.o...igin_of_modern_humans