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CORRECTION: A lot of people very promptly pointed out - although we don’t carry any Neanderthal mitochondrial DNA, we also don’t carry any y-chromosome DNA, so we can’t put the lack of mitochondial DNA down to a lack of male human-female neanderthal interbreeding unless we also put the lack of y-chromosome evidence down to a lack of male neanderthal-female human interbreeding, which obviously doesn’t make much sense.
So as far as I know, then, there’s no major evidence that the majority of interbreeding was one way or another. This doesn’t preclude the two groups being different species - we don’t know the extent of the interbreeding, some studies suggest the amount of Neanderthal DNA we carry could be explained by very little actual interbreeding. That doesn’t mean there was very little interbreeding, you know. There is a example of a human mandible and genetic analysis shows the person had a Neanderthal ancestor not many generatinos back, four or five, and the chances of finding that so readily if interbreeding was really rare are pretty low, as you can imagine.
Four generations of breeding at an average of four children per couple from the baseline of that interbreeding event if we assume something like 50 percent of people who are born, actually survive to reproductive age and reproduce, you know, that’s potentially less than 20 descendents in four generations, potentially less than 70 in six generations. But then, that’s a fairly severe infant mortality rate - if we up the average number of children to six per couple, which is pushing it a bit I think, for the palaeolithic, and we say two-thirds of people born are likely to survive to adulthood and reproduce - then the numbers are obviously larger, you’re looking at about 250 adult descendents in 4 generations, about 4,000 in six generations, in which case it’s not as surprising that we have one of these individuals. But then that’s not at all to suggest that it must have been a rare event, either, you know - you could make a bit of a reach and say the fact that hybrids were so reproductively successful suggests that interbreeding was at least somewhat acceptible culturally in the areas that it happened, and therefore why wouldn't it happen a fair bit?
But I don’t know. I think you get into risky territory there.
But yes, that was just correcting a mistake I made - and I will try not to do so again. And in future if I do make big mistakes like that, I’ll put a correction in the description. So thank you to everybody who pointed that one out.
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