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Genetic Blueprints. To map the chimp genome, researchers used DNA from the blood of a male common chimpanzee (Pan troglodytes) named Clint, who lived at the Yerkes National Primate Research Center in Atlanta. Clint died last year from heart failure at the relatively young age of 24. A comparison of Clint's genetic blueprints with that of the human genome shows that our closest living relatives share 96 percent of our DNA.
More recent research has propped up Darwin's theory of common descent (also called common ancestry): genome analysis reveals the genetic difference between humans and chimps to be less than 2 percent. In other words, humans and chimps have DNA sequences that are greater than 98 percent similar. While the genetic similarity between human and ape strengthened Darwin's theory, a significant, unexplained discrepancy remained. While great apes all have 48 chromosomes (24 pairs), humans have only 46 (23 pairs).