Joe Felsenstein recently posted a rebuttal of a critique of Fisher’s fundamental theorem of natural selection (FTNS). The authors, Basener and Sanford, argue that if new mutation (missing from the original FTNS) is taken into account, the theorem shows that Darwinism is impossible rather than inevitable. I agree with each point of Joe’s rebuttal.
Yet, I think that no discussion of this topic is complete without explaining that Fisher’s view, and more generally the original Modern Synthesis, is inadequate precisely because of the rejection of mutation-limited dynamics.