It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
For decades the conensus view - among the public as well as the world's preeminent biologists - has been that human evolution is over. Since modern Homo sapiens emerged 50,000 years ago, "natural selection has almost become irrelevant" to us, the influential Harvard paleontologist Stephen Jay Gould proclaimed. "There have been no biological changes. Everything we've called culture and civilization we've built with the same body and brain." This view has become so entrenched that it is practically doctrine.
So to suggest that humans have undergone an evolutionary makeover from Stone Age times to the present is nothing short of blasphemous. Yet a team of researchers have done just that. They find an abundance of recent adaptive mutations etched in the human genome; even more shocking, these mutations seem to be piling up faster and even faster, like an avalanche. Over the past 10,000 years, their data show, human evolution has occurred a hundred times more quickly than in any other period in our species' history.
The new adaptations, some 2,000 in total, are not limited to the well-recognized differences among ethnic groups in superficial traits such as skin and eye color. The mutations relate to the brain, immunity to pathogens, sperm production, and bones - in short, virtually every aspect of our functioning.
Why might evolution be picking up speed? What could be fueling the trend? "Well, there's a lot more people on the planet in recent times. In a population you dont have to wait so long for the rare mutation that boosts brain function or does something else desirable." Says John Hawks of the University of Wisconsin at Madison and Gregory Cochan, a physicist and adjust professor of anthropology at the University of Utah.
Ten thousand years ago, there were fewer than 10 million people on Earth. That figure soared to 200 million by the time of the Roman Empire. Since around 1500 the global population has been rising exponentially, with the total now surpassing 6.7 billion. Since mutations are the fodder on which natural selection acts, it stands to reason that evolution might happen more quickly as our numbers surge. Cochran notes, "Darwin himself emphasized the importance of maintaining a large herd for selecting favorable traits."
Perhaps the most incendiary aspect of the fast-evolution research is the evidence that the brain may be evolving just as quickly as the rest of the body. Some genes that appear to have been recently selected influence the function and development of the brain. Other fast-changing genes - roughly 100 - are associated with neurotransmitters, including serotonin, glutamate (involved in general arousal), and dopamine. According to estimates, fully 40 percent of these neurotransmitter genes have been selected in the past 50,000 years, with the majority emerging in just the past 10,000 years.
Originally posted by Wisen Heimer
reply to post by Salt of the Earth
Good lord, this is from Discover Magazine and its also talked about a little bit here. www.newscientist.com...
Half of what you said wasnt even on topic.
And as I included in the OP, the article did not state this as fact. These are largely theories, but there is evidence to support them. I think its absolutely absurd to think that we have not evolved for 50,000 years and evolution will occurr regardless of the survival of the fittest scenario.
[edit on 9-3-2009 by Wisen Heimer]
Ten thousand years ago, there were fewer than 10 million people on Earth. That figure soared to 200 million by the time of the Roman Empire. Since around 1500 the global population has been rising exponentially, with the total now surpassing 6.7 billion. Since mutations are the fodder on which natural selection acts, it stands to reason that evolution might happen more quickly as our numbers surge. Cochran notes, "Darwin himself emphasized the importance of maintaining a large herd for selecting favorable traits."
Google Video Link |
Google Video Link |