Re: What prevents evolution?
Well, I was going to make a response, but I think Midge has pretty much said what I wanted to say on the subject, except for this (from NotReady):
"I don't think your premises establish this. You would need another one, somthing like - Some genetic differences produce advantageous survival characteristics in the phenotype."
That is a subset of this:
d) The differential reproductive success of individuals replicators within the population depends to any extent on phenotype.
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