Re: ChatGPT contributing to current science papers

On 8/13/2024 1:03 PM, JTEM wrote:

  RonO wrote:
 

Multi Regionalism was likely never supported by the molecular data.

 #1.  That's a gross misunderstanding & misrepresentation of this so
called "Molecular Data
 Supposedly, absent any strangely beneficial genes you may have, even
with descendants the "Molecular Data" would completely lose you within
a thousand years!

You didn't read the linked article.  You don't seem to realize that the initial molecular data that is referenced gave rise to the neutral theory of molecular evolution.  The amount of variation could not be explained by selection.  It gave credence to the usefulness of molecular clocks.  Genetic drift is responsible for most of the difference in genetic diversity between populations.

 #2.  The so called "Molecular Data" is racist. It's far more clear in
Asia than in Europe, for example, where it may be easier to image by
another name:  Regional Continuity.
 The overly dogmatic types can't accept "Multi Regionalism" but you
can often grasp "Regional Continuity."
 Australian aboriginals, for example, remained remarkably consistent
even when their DNA was completely swamped by new arrivals, including
the loss of the LM3 insert or Chromosome 11 insert.

The earlier morphological data was often generated and interpreted by racists.  The molecular data is just what it is in each population without the past racist interpretations.  We have so much data and past comparisons that we can take samples from across the world and analyze them blind and determine where those genetics came from.  23 and Me took my data and identified my ancestry as Japanese, but they also told me that my genetics derived from around Hiroshima.  They knew my name was Japanese, but they did not know that both sets of my grand parents came from Hiroshima.  My maternal grandparents settled in Canada and my paternal grandparents settled in California.  Due to the Japanese internment in the US and the ejection of the Japanese from the West Coast of Canada my parents met in Michigan.

 

  The first isozyme and blood group data that started to accumulate after the 1950's indicated that Europeans, Asians and Africans were closely related and that Native Americans came from Asia.

 You just switched from human ORIGINS to PRESENT DAY human dispersal.
 Those are two EXTREMELY DIFFERENT subjects.

There is no data supporting multiregionalism in the extant populations. That is why the linked to article was proposing how there may have been multiregional populations, but they would need to have been constantly mixing among themselves and with the Africans.  You should have read the article before blasting off with your stupidity.
In South East Asia there may have been a Homo erectus population that interbred with Denisovans, but it wasn't a substantial mixing event. The Denisovans transferred a bit of this ancient DNA to modern humans that had already inherited a little Neanderthal DNA as they moved out of Africa.  The multiregional hypothesis is still as dead as it was a couple decades ago.  Denisovans did interbreed with Neanderthal from time to time, but Neanderthal do not have evidence of the more ancient (possibly, Homo erectus) DNA in their genome.  The current scenario is that Homo erectus left Africa, subsequently the population that would become Neanderthals and Denisovans left Africa and started diverging in Europe and Asia.  Denisovans did a little interbreeding with a more ancient population.  Some Africans left Africa around 200,000 years ago and interbred with Neanderthals.  These Africans had a mitochondrial lineage that existed prior to Mitochondrial Eve.  The African population died out in Europe or was absorbed by the Neanderthal.  Their mitochondrial lineage took over and became fixed in the Neanderthal population.  This is why the Denisovan mitochondrial lineages appears to have branched off much earlier than the Neanderthal lineage that existed when African's again left Africa less than 80,000 years ago.  These Africans had a little interbreeding with Neanderthals as they left Africa, and Neanderthal DNA was established at around 2 to 3% of the genome of this population before they dispersed into Europe and Asia. In Europe and West Asia they encountered more Neanderthal, and we have evidence for more interbreeding events, but these seem to be dead ends and those families died out and did not become part of the extant population.  In South East Asia modern humans interbred with Denisovans and some Indonesian individuals have as much as 7% Denisovan DNA.  They also inherited a bit of the more ancient DNA from the Denisovans that may have come from Homo erectus.
Ron Okimoto