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Old 03-19-2013, 10:31 AM  
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Hillbilly Cavemen

Prehistoric Human Skull Shows Signs of Inbreeding



In 2010, the surprising discovery that Neanderthals likely crossbred with our ancestors tens of thousands of years ago generated headlines around the world.

Now, we have a new finding about the sex lives of early Homo sapiens: It looks like they engaged in some inbreeding as well.

That is the conclusion of anthropologist Erik Trinkhaus of Washington University in St. Louis and Xiu-Jie Wu and Song Xing of the Chinese Academy of Sciences’ Institute of Vertebrate Paleontology and Paleoanthropology, based on a fractured 100,000-year-old skull excavated from China’s Nihewan Basin. Their finding, published yesterday in PLOS ONE, is that the skull shows evidence of an unusual genetic mutation that is likely the result of high levels of inbreeding.

The researchers used CT scanning and 3D modeling to join together for the first time the 5 pieces of the fractured skull—known as Xujiayao 11, named for the site where it was found back in 1977—and realized that it exhibited an unusual deformity. When the pieces are combined, they leave a hole on the crown of the skull, but there is no evidence that the fracture was caused by a traumatic injury or disease. As a result, they consider it most likely that the hole is a defect known as an enlarged parietal foramen.
Nowadays, this hole is mostly found in people with a particular pair of genetic mutations on chromosomes 5 and 11—most often a consequence of inbreeding—and occurs in about 1 of 25,000 live births. The mutation interferes with bone formation in the skull over the first five months of an infant’s life, when the pieces of the skull are supposed to fuse together to cover up the “soft spot.”

Given the tiny sample size of human skulls this old and the fact that similar kinds of genetic abnormalities have been seen so often in other prehistoric skulls—the researchers count 22 individuals with skull deformities discovered from this era—Trinkhaus thinks the simplest explanation is that small and unstable human populations forced our ancestors to inbreed.

If no inbreeding occurred, “the probability of finding one of these abnormalities in the small available sample of human fossils is very low, and the cumulative probability of finding so many is exceedingly small,” he said in a press statement. “The presence of the Xujiayao and other Pleistocene [2.6 million to 12,000 years ago] human abnormalities therefore suggests unusual population dynamics, most likely from high levels of inbreeding and local population instability.”


http://blogs.smithsonianmag.com/scie...enceinbreeding
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Old 03-19-2013, 12:30 PM   #16
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Pretty sure i've got some neanderthal blood goin on... got enough hair on my back to make James Caan jealous.

Gotta shave that shit off every few weeks in the summer when i wanna take my shirt off.
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Old 03-19-2013, 01:49 PM   #17
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Originally Posted by CrazyPhuD View Post
In those days it wasn't called inbreeding as much as inraping.
Wow.
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Old 03-19-2013, 01:56 PM   #18
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inbreedin' my fav game .. pumpkin .....
I don ..... wha?
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Old 03-19-2013, 01:58 PM   #19
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I don ..... wha?
What do the people in Arkansas do on Halloween?
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Old 03-19-2013, 02:00 PM   #20
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Not saying that they are right or wrong, but there are a lot of assumptions that have to all be correct in order for their conclusion to be accurate.

There MIGHT be a defect. If there is...

The defect is MOSTLY caused by a specific mutation. If that is the case here...

It's OFTEN caused by inbreeding.


There seems to be a lot of faith required in order to accept their science.
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Old 03-19-2013, 07:56 PM   #21
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That would explain a lot about the modern world.
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Old 03-19-2013, 08:00 PM   #22
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Were they found in Denver?
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Old 03-19-2013, 08:04 PM   #23
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That reminds me, I've got a family reunion this Sat. Think I'll get all spruced up go there and cruise for some chicks...
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Old 03-19-2013, 08:08 PM   #24
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The more I think about it, this is kind of the unified field theory of human behavior. It's the core explanation that neatly explains all of human history.
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Old 03-19-2013, 08:23 PM   #25
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Well, I mean the founder effect can be seen in a lot of closed communities. It's the reason Amish people are usually born with an extra finger. I think morals went as far as empathy and protecting the tribe. In smaller communities in America it's not as uncommon as you think for people to marry within their family tree. It usually takes a few generations before problems arise.

Also, I post this any time inbreeding comes up.

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Old 03-19-2013, 08:26 PM   #26
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You have to realize , they didn't have internet, tv . When they came of age, they probably just went off on their own. Long enough they didn't realize the pussy they found was their sister. In their mind they may have thought, she kinda looks like my sister would have but like dogs, they just humped every female in heat.
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Old 03-19-2013, 08:26 PM   #27
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The universe and humans are only 6,000 years old. Anyone knows that.

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I was gonna say that lol
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Old 03-19-2013, 08:38 PM   #28
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There seems to be a lot of faith required in order to accept their science.
No, that's doesn't really require any faith to accept their science. Anthropologists examined atypical fossilized human remains and noticed that the abnormality coincides with a known genetic disorder, and that the remains show no sign of trauma. The genetic disorder is known to occur highly in births resulting from inbreeding. The affected remains are a fairly high percentage of the overall remains. They propose the theory that the humans interbred to account for the facts that were put before them.
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Old 03-19-2013, 08:44 PM   #29
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IF they came in heat like animals. It probably couldn't be helped.
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Old 03-19-2013, 10:04 PM   #30
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