evolution of form

[Charles A. Whittaker]

I have heard it said that humans and chimps are 98% identical
at the genetic level.  Why then do chips look like chimps and
people look like people?  What do you think would happen if you 
replaced every bit of protein coding sequence in the chimp genome
with human coding sequence?  In other words, is the difference in
appearance generated at the level of the 2% difference or somewhere
else?

just wondering

charlie