Difference between humans and apes A matter of expression

Difference between humans and apes A matter of expression

Why are humans and apes so different if their genomes are so similar? Less than four percent of the chimpanzee's genetic code is different from our own, a tally so tiny that some speculate the distinction between primates may lie in just a handful of key genes -- perhaps as few as 50 out of 20,000 or so in the human genome.