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Moontanman
Post  Post subject: Inter breeding in ancient hominids  |  Posted: Thu Dec 19, 2013 3:26 pm
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Recent genetic studies indicate ancient humans interbred with at least three known and possibly one unknown hominid species. This interbreeding went on for thousands of years in a possibly back and forth gene exchange between the species..

http://www.sciencedaily.com/releases/20 ... 133658.htm

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Family tree of the four groups of early humans living in Eurasia 50,000 years ago and the lingering genetic heritage due to interbreeding. (Credit: Image courtesy of University of California - Berkeley)


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Neanderthal Genome Shows Early Human Interbreeding, Inbreeding
Dec. 18, 2013 — The most complete sequence to date of the Neanderthal genome, using DNA extracted from a woman's toe bone that dates back 50,000 years, reveals a long history of interbreeding among at least four different types of early humans living in Europe and Asia at that time, according to University of California, Berkeley, scientists.


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iNow
Post  Post subject: Re: Inter breeding in ancient hominids  |  Posted: Thu Dec 19, 2013 6:14 pm
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What do folks feel that means for our previous classifications of and ideas about Neanderthals?

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Moontanman
Post  Post subject: Re: Inter breeding in ancient hominids  |  Posted: Thu Dec 19, 2013 6:19 pm
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iNow wrote:
What do folks feel that means for our previous classifications of and ideas about Neanderthals?



IMHO we are getting closer to realizing just how fluid genetics are and how genes flow through populations. many people seem to think that species just suddenly appear and stop interbreeding or that a species has to physically move from area to another when in fact gene flow has more to do with it.

In a manner similar to this...



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marnixR
Post  Post subject: Re: Inter breeding in ancient hominids  |  Posted: Thu Dec 19, 2013 10:05 pm
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still not convinced that there was a massive amount of interbreeding though
imo anything between 0.1 and 5% still is a rather limited admixture

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iNow
Post  Post subject: Re: Inter breeding in ancient hominids  |  Posted: Fri Dec 20, 2013 1:12 am
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How big were the populations, though? If there were only a hundred, then 5% is only 5, but if there were a hundred thousand, then 5% is 5,000 and it becomes more significant, especially when viewed on a tribal / local pack level scale.

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marnixR
Post  Post subject: Re: Inter breeding in ancient hominids  |  Posted: Fri Dec 20, 2013 7:19 am
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populations were indeed low, and there's plenty of signs of inbreeding in local bands of people which probably did not exceed that of an extended family - so might not have been too fussy who to mate with as long as it had close-enough human recognition

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marnixR
Post  Post subject: Re: Inter breeding in ancient hominids  |  Posted: Fri Dec 20, 2013 7:38 pm
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here's more :

Neanderthal genome shows high levels of inbreeding

especially the following passage :

Quote:
Unfortunately, the extent of the relationship cannot be determined with current evidence. Though it is clear there was not extensive interbreeding, it becomes less clear how it happened in the first place. It is possible that an ancient Neanderthal group got involved with humans as an isolated incident, or breeding might have occurred sporadically over time.

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iNow
Post  Post subject: Re: Inter breeding in ancient hominids  |  Posted: Fri Dec 20, 2013 7:57 pm
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That seems to add weight to the small population numbers argument. One imagines inbreeding is more common in groups that have lower numbers.

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