Chimp, Human DNA Maps Reveal Big Role of Tiny Changes
In accumulation, tiny genetic changes could help account for the vast differences between humans and chimpanzees, researchers report in the journal Nature. Researchers have found that less than 1.5 percent of the DNA found on chromosome 22 in humans differs from the DNA on the same chromosome in chimps. But those small genetic variations could help explain human evolution. NPR's Joe Palca reports.
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