by Keith_McClary » Wed 20 Jul 2011, 02:10:52
$this->bbcode_second_pass_quote('Daphne64', 'I')f most random mutations are deleterious, how in world could we make that big a jump without some kind of "engineering" hand?
The "deleterious" ones died, the good ones went forth and multiplied.
$this->bbcode_second_pass_quote('Daphne64', 'A')lso, why have we not seen any changes in humans over the last 4000 years
Human evolution kicks into high gear$this->bbcode_second_pass_quote('', 'F')or decades the consensus 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 Gouldproclaimed. “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 has 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 ever 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 genetic 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, the digestive system, life span, immunity to pathogens, sperm production and bones — in short, virtually every aspect of our functioning.