Skip to comments.Find raises doubts on key theory of human evolution
Posted on 04/02/2007 7:10:57 PM PDT by DaveLoneRanger
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That is difficult to tell unless the number of harmful homozygous alleles are known for the population. However we do know that the populations on Pitcairn Island, Easter Island and the Amish in the US have a higher than average incidence of homozygous alleles. With 2 people the number of alleles at a given locus is only 4 which means that the third generation would start experiencing homozygous alleles.
"How big was a *small group* that migrated?"
Small populations would probably be in the thousands. It would also not be a single group that left Africa, it would be multiple groups which interbred. The idea that we all descended from a small group does not imply that they were the only humans alive in the area. It just means that all the descendants of those outside that group have died out.
While this theory may have been named in the '80s, it was something I was exposed to in evolution classes in the '70s.
What is at issue is how certain traits came to be in different world groups. One theory is that there was some continuity of traits from Homo erectus to modern man, even though the main impetus of the evolution to modern human took place in Africa and spread from there. The other theory is that there was no such continuity of traits from Homo erectus to modern man, and the spread from Africa was responsible for all subsequent groups.
You really should try to understand an issue before you jump all over it.
How does one year of basic biology stack up to years of grad school?It doesn't. You said I needed to look at both sides. I explained that I do, have and am. Now are you just having trouble keeping track of the responses to different accusations, or are you trying to twist my words?
Yes, that's the place.
Zhoukoudian is where Davidson Black and Teilhard de Chardin found "Peking Man". In 1921 Black found two teeth. Upon studying the upper molar carefully, he concluded that it obviously belonged to a new species of tarzan, Sinanthropus pekinensis, a knuckle-dragging ape man or something like that. Wouldn't you? Anyway, others were not so easily convinced. Maybe three teeth would have clinched it for Davidson.
Chardin got involved in the late 1920's, along with C. C. Young and Wengzhong Pei. Upon investigating ash-pits in what may be some kind of ancient lime-quarry, other stuff turned up. The New York Times (ha ha) reported that "ten skeletons unearthed simultaneously with an unbroken skull", and even Nature reported something equally silly, but it turned out that all that was merely a slight misreading of Chardin's comment: "My impression is that the fissure containing Sinanthropus (Black estimates that there are traces of at least 10 individuals) is..." What they actually found was one (1) piece of skull-cap.
Lots of other fragments and teeth were supposedly found subsequently, casts were made, drawings, grainy photos, reconstructions. There was some controversy concerning the reconstructions, as bits and pieces of anything were joined together to make complete skulls. But G. Elliot Smith denied this, and claimed the reconstructions were solid, because they lined up with Piltdown man. There was some evidence that "Peking Man" was chomped on by modern man, but theories about cannibalism and hyenas made that go away. The reports about exactly what was found are grossly inconsistent, but it doesn't matter anyway, because all of it disappeared, as is well known.
If you go to Zhoukoudian today, all you will see, indeed all you will ever see of "Peking Man" - and that on a lucky day - is a fragment of skull-cap, supposedly discovered in 1966. What you will also see are many top-knotch bronze casts like this one
and this one
and some nice art:
And a good pic of Dr Pei:
Which is proof enough. What more could one want?
Try this link: Peking Man for additional details.
You might also try reading what is at The Peking Man World Heritage Site at Zhoukoudian rather than just lifting a few pictures in a silly effort to present the findings in a bad light.
I like Chinese thought,
the wisdom that Confucious taught,
if Darwin has anything to shout about,
the Chinese will survive us all
without any doubt!
Just updating the GGG info, not sending a general distribution.
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