Then you don’t understand the theory. Natural Selection for the best adapted promotes the successful mutations. There is a lot of so called Junk DNA in the chromosomes. Though the term junk has fallen out of favour, a lot of the code does not program for changes in the organism, it may simply be redundant. There have been significant advances since The Selfish Gene was written, principally the science of Epigenetics. There is a book called Junk DNA by Nessa Carey, It’s a useful read, but things are changing really fast in the field as new statistical computational methods are used for analysis. A year is a log time in geneti