“So what constraint would prevent a mouse from changing its DNA a few % to evolve into a rat like creature?” [excerpt]Uh, a mouse is a rat like creature.
So you propose there would be no “constraints” on a mouse changing into a rat, yet imagine some undefined “constraints” on an ape changing its DNA a small % and ONE TENTH of the genetic distance you seem to think would be so easy to bridge between mouse and rat.
What would be your basis for that assumption?