Yet humans remain humans â€¦ and dogs remain dogs, water rats remain water rats, E. coli remain E. coli ... funny that.
And humans remain mammals and humans remain vertebrates. What's your point?
Multiply the billions of mutations/generation you mentioned by the thousands of years that humans have been breeding animals and plants ... so we're talikng possibly trillions of mutations in one species ... yet breeeders ALWAYS eventually encounter genetic limits to how much the original organism can be changed.
Trillions of mutations that always lead to genetic dead-ends ... funny that.
You keep repeating the same mistake. Breeding is not the artificial version of evolution. You'd have to combine breeding with genetic engineering to have an accurate analogy of the artificial to the natural. That is:
Such problems are not due to mutation. They're due to the selection process. For example, some of the characteristics selected for in the German Shepherd were linked genetically to hip dysplasia. There is no hip dysplasia mutation. The alleles for hip dysplasia were already present in the wolf genome, but selection and inbreeding has made them more prevalent in the German Shepherd.
Okay, thanks; I need to read up on this stuff - my ignorance is showing. (In the last few days I've been reading stuff on the talkorigins.org site - there's some really fascinating info there - the "tail" in humans embryos and ERVs in humans, for example. It strikes me as a very professional organisation.)