Parental conflict does not necessarily lead to the evolution of imprinting.

Abstract excerpt

For some genes, the epigenetic state (whether they are expressed) depends on whether the gene is inherited through the mother or the father. Such imprinting, or parent-specific gene expression (PSGE), occurs in mammals, including humans, and higher plants. The theory that PSGE solves genetic conflict between mother and father is widely accepted. We argue, however, that the conditions for PSGE to evolve are...

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