Are we undermining our own evolution?
ericwaller: It's not possible (by definition) to "short-circuit" or undermine evolution. Modern medicine is our species acting within the process of evolution. Just as we consider early humans to have "evolved" the ability to use crude tools, we have "evolved" the ability to use penicillin, brain surgery, etc."Survival of the fittest" is a useless tautology. An organism's evolutionary fitness, if there were such a thing, would be its ability to survive to reproductive age. So of course the fittest survive, we've defined fitness to mean survival.In reality it's the species that has an evolutionary fitness; and the distinction is important. Take a bee colony for example, a huge number of the bees are infertile.To address your example: infertility treatments may catalyze an evolutionary process of selecting against those who are disinterested in child rearing. Or, like the bee colony, infertility in some members of the species may be evolutionarily advantageous; hard to imagine, but not without precedent.