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The Role of Causal Processes in the Neutral and Nearly Neutral Theories

Published online by Cambridge University Press:  01 January 2022

Abstract

The neutral and nearly neutral theories of molecular evolution are sometimes characterized as theories about drift alone, where drift is described solely as an outcome, rather than a process. We argue, however, that both selection and drift, as causal processes, are integral parts of both theories. However, the nearly neutral theory explicitly recognizes alleles and/or molecular substitutions that, while engaging in weakly selected causal processes, exhibit outcomes thought to be characteristic of random drift. A narrow focus on outcomes obscures the significant role of weakly selected causal processes in the nearly neutral theory.

Type
The Role of Causal Explanations in Understanding Natural Selection
Copyright
Copyright © The Philosophy of Science Association

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