And since it happens, the odds are irrelevant.
There is absolutely no proof of macro-evolution. No proof of series transforming themselves into something more complex, with new traits, new abilities. There is no proof of anything ever evolving. In fact there is tons of proof showing that there is no need for any species to evolve. The simplest creatures, single celled organisms, are the most varied, most successful organisms on earth. There is absolutely no necessity for anything to evolve and the cause of evolution has always been said to be necessity. There is no such necessity.