Epigenetic silencing may aid evolution by gene duplication.

Abstract excerpt

Gene duplication is commonly regarded as the main evolutionary path toward the gain of a new function. However, even with gene duplication, there is a loss-versus-gain dilemma: most newly born duplicates degrade to pseudogenes, since degenerative mutations are much more frequent than advantageous ones. Thus, something additional seems to be needed to shift the loss versus gain equilibrium toward functional...

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