....From 1964 to 2004, it was believed that humans are almost identical to
apes at the genetic level. Ten years ago, we thought that the
information coded in our DNA is 98.5% the same as that coded in
chimpanzee DNA. This led some scientists to claim that humans are simply
another species of chimpanzee. They argued that humans did not have a
special place in the world, and that chimpanzees should have the same
’rights’ as humans.
....We also find places where two pieces of human genome align with only one
piece of chimp genome, or two pieces of chimp genome align with one
piece of human genome. This ”copy number variation” causes another 2.7%
difference between the two species. Therefore the total similarity of
the genomes could be below 70%.