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originally posted by: Baddogma
I read and re-read the article and am still amazed by what it said... and might be fuzzy on the full implications.
If I heard correctly, there was a new bottleneck discovered from 250,000 or so yrs ago, and all humans are descended from 2 survivors.
Then it said that every animal on Earth are descended from some common lifeform from that same bottleneck... which makes no bloody sense.
Did I inhale too much carbon monoxide, or is that what the article said?
originally posted by: toms54
a reply to: one4all
I'm not specifically trying to comment on your post but on all the posts in this thread that are trying to discuss whether all humans derived from one Adam and Eve like pair. That is not what the OP is about.
He is discussing an extinction event. Long before there were any humans, nearly all life on earth went extinct. All the animals, not just humans were supposedly populated by one pair of survivors. At least that's what the source maintains.
This extinction event happened not only this one time but several times in earth's history. Google extinction event and you get this right on the search page without even clicking anything:
Biologists suspect we're living through the sixth major mass extinction. ...
Late Devonian, 375 million years ago, 75% of species lost. ...
End Permian, 251 million years ago, 96% of species lost. ...
End Triassic, 200 million years ago, 80% of species lost. ...
End Cretaceous, 66 million years ago, 76% of all species lost.
The one being referred to, the Permian, was the most severe.
Even so, I don't believe they can prove all animal life came from one breeding pair no matter how similar DNA is between species. Maybe it came from a small breeding population or even one that became inbred but they can't prove one pair in my opinion. And even if that does prove true, there could still be input from strains that later died out.
That's what the study concluded.
Contemporary sequence data cannot tell whether mitochondrial and Y chromosomes clonality occurred at the same time, i.e., consistent with the extreme bottleneck of a founding pair, or via sorting within a founding population of thousands that was stable for tens of thousands of years . As Kuhn points out unresolvable arguments tend toward rhetoric.