> The mutation rate across a genome is not constant First time I heard about this, and it seems to explain why some animals/organisms hardly evolve at all over

> The mutation rate across a genome is not constant First time I heard about this, and it seems to explain why some animals/organisms hardly evolve at all over the eons (crocodiles comes to mind). So is this (the mutation rate) an established and accepted concept within evolutionary biology? and can it be used to explain the relative stability of some species? Sorry, not very educated in this area, just curious.