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Sympatric Speciation from Interaction-induced Phenotype Differentiation

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4 Author(s)

A novel viewpoint for evolution is presented, by taking seriously into account the relationship between genotype and phenotype. First, as a consequence of dynamical systems theory, phenotypes of organisms can be differentiated into distinct types through the interaction, even though they have identical genotypes. Then, with the mutation in genotype, it is shown that the genotype also differentiates into discrete types, while maintaining the ‘symbiotic’ relationship between the types. This process is robust against, sexual recombination, because offspring with intermediate genotypes are less fit than their parents. Accordingly, a plausible scenario for sympatric speciation is presented. Relevance of our scenario to the historical evolution as well as to artificial evolution is discussed