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Humans Evolved From a Single Origin In Africa
Invisible Pink Unicorn writes "Researchers at the University of Cambridge have combined studies of global human genetic variations with skull measurements worldwide to show conclusively the validity of the single origin hypothesis. The alternative hypothesis contended that different populations independently evolved from Homo erectus to Home sapiens in different areas. The lead researcher explains, 'The origin of anatomically modern humans has been the focus of much heated debate. Our genetic research shows the further modern humans have migrated from Africa, the more genetic diversity has been lost within a population. However, some have used skull data to argue that modern humans originated in multiple spots around the world. We have combined our genetic data with new measurements of a large sample of skulls to show definitively that modern humans originated from a single area in Sub-saharan Africa.' The article abstract is available from Nature."
None of those posts appeared yet. Why invoke them? For karma?
The sooner they are relegated to obscurity, the better -- then most people will consider them the crackpots that they are. Giving them attention before they even appear doesn't help.
"Trolls they were, but filled with the evil will of their master: a fell race..." -- J.R.R. Tolkien on Olog-hai
Survival of the fittest.
Perhaps one day, when life started out, there were many different types of bacterial lifeforms. Turns out that only a handful managed to stay alive in the ever-changing environment. Some of those just happened to have the bad luck of being wiped out by a meteor shower. And one of few remaining ones was a bloodthirsty killer that ate the few remaining other species; we decended from that guy.
Perhaps something completely different happenned. The chances of a lifeform being succesful in it's environment is likely something so small, the number of digits would overflow this comment box. Just count yourself lucky you were born from the odd chance that one lifeform did manage to survive.
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Isn't it possible that after submitting this article he found out more information?
How exactly do you submit a retraction for a slash article?
I would rather have Unicorn posting his own update than having someone ripping the original to pieces.
His(her/it) actions are commendable in my book.
liqbase
Don't forget that you're only seeing the survivors. It's possible that several variations of primeval life did arise, but one variation out-competed the others, or was the sole survivor of some catastrophe. The fossil record, fragmentary as it is, has numerous examples of whole species groups going extinct, and there's no reason to imagine that life was any less challenging or competitive before it could form fossils.
2*3*3*3*3*11*251
Another fix:
Homo erectus = Adam
Home sapiens = Eve
They were probably khoisan"
What were (formerly?) called caucasian, mongoloid and negroid probably evolved from them.
I know it's hard to fit into your leftist racialist view of the world, but deal with it.
It's completely irrelevant, but yes, most dark-skinned people do in fact decrease melanin if they don't get sun exposure.
Your willful attempt to confuse evolution and Lamarckism would earn you a spot on my foes list if you weren't an AC.
I am not a scientist, nor do I play one on TV. But my understanding of the way evolution worked is that you need a breeding population sharing common mutations and traits in order to lock in evolutionary traits. The old textbook example for regular speciation within a main population a fertile jungle valley split in two by a great river. Species A was once on both sides of the river and populations could interbreed if presented the opportunity. But given enough isolation, and especially if any environmental factors differ on one side or the other, a Species B can emerge. When the changes are minor, one could refer to the changed one as a sub-species. If the changes become very pronounced, such that interbreeding is difficult or rarely results in viable offspring, then you could say that second population constitutes a new species.
Given that two identical populations can drift away from the ability to interbreed through nothing more than isolation, how likely would it be that one species, scattered across many environments, could independently evolve into a new species whose members could interbreed? That seems a bit off!
I do think that hybrid species are pretty cool, even though they don't occur too often in nature. We had the polar/kodiak hybrid shot a year or so back. Zoos also have many examples of lygers, tylons, etc. Wolves and domestic dogs can interbreed, the same goes with cyotes and jackals as well. It does make one wonder how far humans could drift apart if several populations were isolated for 20,000 years. I wonder if they'd all still look alike except for different bumpy foreheads?
Kwisatz Haderach
Sell the spice to CHOAM
This Mahdi took Shaddam's Throne
Adam and Eve were black? Next you'll be telling us that Jesus was Jewish!
Seriously, though, the creationists I respect go to the Bible/Koran/Talmud and say "God created the heavens and the earth" then go to a science textbook to figure out how he did it.
You are reading a copy of my copyrighted post.
Anyways, some anthropologist took this population/genetics research and applied it to human populations. First off, they had to show that there was more diversity in Africa. They did this with genetics. So then if Africa has the most human diversity, and the above postulate about populations and diversity is true, then humans must have originated in Africa.
Computers are useless. They can only give you answers.
-- Pablo Picasso
If Neandertal's and moderns were capable of producing viable, reproductively-capable offspring, then one would expect to find in the molecular data some reflection of a more ancient origin. The mtDNA research thus far indicates not, but there's still some possibility as we peer into Neandertal nuclear DNA that we may find some links there. That would certainly alter the Out of Africa theory from an exclusionary one to having to allow for local hominid populations descended from earlier H. erectus migrations having to be counted into the mix.
Let's be clear, though, that even making allowances for Neandertals contributing to modern human genes still is not the strong statement that the Multiregional Hypothesis makes; namely that a number of modern human populations evolved from earlier hominid migrations out of Africa, and that gene flow has largely kept us homogenous and not lead to reproductive isolation. The growing body of genetic evidence seems to topple the multiregional theory, but doesn't necessarily state that some older populations couldn't have added something to our modern genetic makeup.
The world's burning. Moped Jesus spotted on I50. Details at 11.
Good points. I'm an evolutionist, and I find it sad that you are unlikely to be modded up on this. (Against the group-think and all that.)
When I read the article, the first thing I thought was 'I thought we could all agree on this?' That's the 1 big (important) thing the ID and Evo people agree on: We came from a single source.
Of course, I still haven't ruled out that possibility that evolution is controlled by God. It kind of muddies things a bit.
"If you make people think they're thinking, they'll love you; But if you really make them think, they'll hate you." - DM
Actually, it is simpler than that. Movement out of Africa would occur as small groups leave, to go to other places. Those groups will only carry a subset of the alleles from the larger population. Thus, they will be less genetically diverse.
;)
And it is nice to see another anthropologist on Slashdot. I have my degree in anthropology (focusing in archaeology), with a minor in statistics.
Rhapsody in Numbers
Also, people in colder climates would require clothing to stay warm which means they have less skin to expose to the sun, this in turn would increase the need for lighter skin to create more vitamin D.
I should further clarify perhaps, that GOOD science runs from hypothesis to data gathering, testing, and conclusion, while POOR science starts with the conclusion, then gathers evidence, rarely tests (or does not test rigorously enough, or only tests certain applications in which the original conclusion would prove to be true while avoiding or dismissing other testing which might find flaw with it).
"good" science? It's a perfectly valid methodology to devise a theory that isn't supported by evidence and then look for the evidence. I really see no problem with it, and why we should think of it as "bad" science. "bad" science would be science that isn't testable, falsifiable, ignores data, reaches conclusions that don't logically follow, etc. I have no idea if the guy in question produces good science or bad science (as defined above), but then I'm not really addressing that at all.
AccountKiller
Perhaps several different biochemistries developed, with one becoming too successful and displacing others.