Heslop Harrison ( Harrison and Garrett 1926; Harrison 1928 ) suggested that the increase of melanic moths in industrialised regions was due to " mutation pressure ", not to selection by predators which he regarded as negligible.
2.
The neutral theory of molecular evolution proposed that most evolutionary changes are the result of the fixation of neutral mutations by genetic drift . Hence, in this model, most genetic changes in a population are the result of constant mutation pressure and genetic drift . This form of the neutral theory is now largely abandoned, since it does not seem to fit the genetic variation seen in nature.
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