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From: JTEM <jtem01@gmail.com>
Newsgroups: talk.origins
Subject: Re: human population bottleneck
Date: Wed, 25 Dec 2024 20:29:52 -0500
Organization: Eek
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On 12/25/24 5:40 PM, erik simpson wrote:
> https://www.science.org/doi/10.1126/science.abq7487
> 
> Genomic inference of a severe human bottleneck during the Early to 
> Middle Pleistocene transition
> 
> Abstract
> Population size history is essential for studying human evolution. 
> However, ancient population size history during the Pleistocene is 
> notoriously difficult to unravel. In this study, we developed a fast 
> infinitesimal time coalescent process (FitCoal) to circumvent this 
> difficulty and calculated the composite likelihood for present-day human 
> genomic sequences of 3154 individuals. Results showed that human 
> ancestors went through a severe population bottleneck with about 1280 
> breeding individuals between around 930,000 and 813,000 years ago.

It was 800,000 years ago, or a tad more recent.

"Molecular clock" or "Molecular dating" sucks. It always exaggerates.
It assumes a slow, clock like pace of change when, by definition, a
bottleneck event is pretty damn quick.

Google:  Founder effect.

Within a single generation the genetics that typify a population can
completely change.

The premise is also based on a fantasy, not how DNA actually works. If
you do the Google, for instance, most sources insist that your DNA
will be completely wiped from humanity within a thousand years, barring
anything special. And of course if there is anything special then that
means any 10 other people's DNA will be wiped in a thousand years...

This is assuming that you all have living descendants.

Yes you have many, Many, MANY ancestors for whom not a trace of their
DNA can be found in you...

A fantastic illustration of this point is the LM3 or Chromosome 11
insert that identifies a mtDNA ancestor *Far* older than any
"Mitochondrial Eve" for billions of people, that would be completely
unknown and unguessed at without the lucky Chromosome 11 insert...

That's it. We leap from no-reason-to-so-much-as-suspect these deeply
archaic Eurasian ancestors to confirmation of their existence, all
because of one lucky mutation. And, it's a mutation that completely
dissolves the "Molecular Clock" mtDNA dating, as that mtDNA that
made the leap is strangely missing all this clock-like mutation...





-- 
https://jtem.tumblr.com/tagged/The%20Book%20of%20JTEM/page/5