Re comment:- " I would hazard to guess that man at the end of the 
> paleolithic period could not interbreed with his ancestors from the 
> beginning of that period because of the ensuing evolutionary changes 
> within the time frame of the paleolithic.
> 
> http://en.wikipedia.org/wiki/Paleolithic"

 

While I am aware of specific modern genotypes which also existed in the Upper Palaeolithic(and which undoubtedly could interbreed), I seriously doubt that we couldn't interbreed with homo erectus and similiar earlier types. The multiregional hypothesis makes more sense and seems to imply a great deal of interbreeding(gradual hominisation etc.) between different types, ultimately culimating in Modern Man. The alternative is the extremely unlikely scenario that all these former types simply died out, 1 after another, due to acts of Nature/climate change(despite their sizeable intelligence compared to non-hominid species), leaving the way for modern man to appear. The argument that humans wiped out Neanderthals and the like doesn't hold up as any glance at  more recent history shows that invading tribes virtually never completely wipe out native tribes (and even intermarry with them , in many cases)(tasmanians being practically the only exception I can think of).


 

Geoff

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