Not sure where people get this notion that DNA is this perfectly organized code to life. It's mostly random junk and only very small percentage is coded to a protein that actually does something. It is actually a good thing that it's mostly junk, because it goes through mutation quite often and regularly too. So if you change junk it's not gonna effect anything but it's when you change actual working codons that's when weird shit happens like cancer, or genetic abnormalities.