Hold on, you're getting ahead of yourself.
it is certain that the not-mutated organism will survive.
That claim is completely refuted by these two experiments.
https://en.wikipedia.org/wiki/Luria–Delbrück_experiment
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC169282/
In those experiments, only the mutants survived on the selection plates.
Most mutations will not procreate.
There is not a human alive who is not a mutant. Only mutants procreate.
You still have to make a case for beneficial mutations, that become dominant and bring an advantage or new trait.
They are among the 40 million mutations that separate chimps and humans. They are the mutations that make humans what they are. They are the mutations responsible for our bigger brain, upright stance, and the other human features.
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