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Originally Posted by DyerWolf
I think that's a bit too strong of a presumption.
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Probably. But the point I was trying to make (needlessly, as it turns out
) was that information would have spread very, very slowly, too much to effect all the gene pools.
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If various members of the homo family lived in proximity to one another, it is quite possible for them to have interbred - especially on the fringes where the groups intermingled. If for no other reason than because outcasts find outcasts.
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It isn't known whether it's possible or not. Genetics isn't that simple, there may be a specific gene or set of genes that wasn't compatible. Even among humans, it sometimes happens that two individuals are not mutually interfertile.
Amount of genetic difference plays only part of the role, the specific
types of those genes also matter. What you say makes logical sense, but that's not evidence. Without living Neanderthals to examine, it's an open qustion.