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For Those Interested in Archaeology

Discussion in 'Free Fire Zone' started by GRW, Jan 19, 2009.

  1. GRW

    GRW Pillboxologist WW2|ORG Editor

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    "The first people to step foot in the Americas were harboring a sliver of DNA from two extinct Eurasian human groups: the Neanderthals and the Denisovans, a new study finds. This genetic relic could have helped the earliest Americans fight diseases they encountered in their new environment, the researchers proposed.
    Everyone alive today is "a result of like three different species coming together," study co-author Fernando Villanea, a population geneticist at the University of Colorado Boulder, told Live Science.
    "What we think has happened is that humans had this archaic variation," study co-author Emilia Huerta-Sanchez, a population geneticist at Brown University, told Live Science. As people expanded into the Americas, they did not have to wait to develop new mutations to fight off new pathogens and could instead draw from the arsenal of genetic variants they gained from other human groups, she said.
    In the new study, published Thursday (Aug. 21) in the journal Science, the researchers detailed their analysis of MUC19, a protein-coding gene with various functions, including coding for the consistency of mucus. They found that 1 in 3 Mexicans alive today has an MUC19 gene similar to that of Denisovans, a mysterious group of ancient humans who lived throughout Asia from about 200,000 to 30,000 years ago."
    The first Americans had Denisovan DNA. And it may have helped them survive.
     
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  2. GRW

    GRW Pillboxologist WW2|ORG Editor

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  3. GRW

    GRW Pillboxologist WW2|ORG Editor

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  4. GRW

    GRW Pillboxologist WW2|ORG Editor

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  5. CAC

    CAC Ace of Spades

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    400,000 years is a massive jump - I predicted at least 500,000 years quite a while ago as this made more sense to me...We are not far off that mark. Interesting that they say there is evidence of trade...Who are they trading with 400k years ago??
     
  6. CAC

    CAC Ace of Spades

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    400,000 years is a massive jump - I predicted at least 500,000 years quite a while ago as this made more sense to me...We are not far off that mark. Interesting that they say there is evidence of trade...Who are they trading with 400k years ago??
     
  7. GRW

    GRW Pillboxologist WW2|ORG Editor

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    I would think any trade routes would be pretty long distance.
     
  8. GRW

    GRW Pillboxologist WW2|ORG Editor

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  9. GRW

    GRW Pillboxologist WW2|ORG Editor

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    "A million-year-old human skull found in China suggests that our species, Homo sapiens, began to emerge at least half a million years earlier than we thought, researchers are claiming in a new study.
    It also shows that we co-existed with other sister species, including Neanderthals, for much longer than we've come to believe, they say.
    The scientists claim their analysis "totally changes" our understanding of human evolution and, if correct, it would certainly rewrite a key early chapter in our history.
    But other experts in a field where disagreement over our emergence on the planet is rife, say that the new study's conclusions are plausible but far from certain.
    The discovery, published in the leading scientific journal Science, shocked the research team, which included scientists from a university in China and the UK's Natural History Museum.
    "From the very beginning, when we got the result, we thought it was unbelievable. How could that be so deep into the past?" said Prof Xijun Ni of Fudan University, who co-led the analysis.
    "But we tested it again and again to test all the models, use all the methods, and we are now confident about the result, and we're actually very excited."
    When scientists found the skull, named Yunxian 2, they assumed it belonged to an earlier ancestor of ours, Homo erectus, the first large-brained humans. That's because it dated back about a million years, long before more advanced humans were thought to have emerged.
    Homo erectus eventually evolved and began to diverge 600,000 years ago into Neanderthals and our species – Homo sapiens.
    But the new analysis of Yunxian 2, which has been reviewed by experts independent of the research team, suggests that it is not Homo erectus.
    It is now thought to be an early version of Homo longi, a sister species at similar levels of development to Neanderthals and Homo sapiens.
    Genetic evidence suggests it existed alongside them, so if Yunxian 2 walked the Earth a million years ago, say the scientists, early versions of Neanderthal and our own species probably did too.
    This startling analysis has dramatically shifted the timeline of the evolution of large-brained humans back by at least half a million years, according to Prof Chris Stringer of the Natural History Museum, a co-lead on the research.
    He said there are likely to be million year-old fossils of Homo sapiens somewhere on our planet - we just haven't found them yet."
    Million-year-old skull rewrites human evolution, say scientists - BBC News
     
  10. GRW

    GRW Pillboxologist WW2|ORG Editor

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  11. George Patton

    George Patton Canadian Refugee

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    Good stuff! Thanks Gordon
     
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  12. GRW

    GRW Pillboxologist WW2|ORG Editor

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    Cheers!
     
  13. GRW

    GRW Pillboxologist WW2|ORG Editor

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  14. GRW

    GRW Pillboxologist WW2|ORG Editor

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