RE: Pre-Historic Nookie!
August 23, 2018 at 3:28 pm
(This post was last modified: August 23, 2018 at 3:40 pm by The Grand Nudger.)
(August 23, 2018 at 3:22 pm)Anomalocaris Wrote: So it diesn’t Say Neanderthal and HSS are necessarily close enough to have no barriers to interbreeding that would have made them difference species.
I think you may be off on the amount of interbreeding it would take. If it only happened once, that would suggest that every living human being (with that marker) has that couples fertile progeny somewhere in their ancestry - both that and their progeny being fertile are unlikely..if they were different species- and we're talking about an interaction between three populations, here.
Regardless there's a misperception regarding subspecies and breeds. Different subspecies within a species can and do have barriers to regular interbreeding. Just as different breeds within a subspecies do. This is -why- the notion that we're dealing with three subspecies fits the data better than the idea that there were three distinct species capable of interbreeding with each other -and then passing on that dna-.
Those barriers don't make them different species, though they commonly make them different subspecies, breeds, etc. As jorg mentioned, isolation is probably the best way to address species. Ill try to find it, but there was a great definition I read once, something about a species being the most inclusive reproductive grouping between hypothetically campatible populations.
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