Bias in the introduction of variation as an orienting factor in evolution

@article{Yampolsky2001BiasIT,
  title={Bias in the introduction of variation as an orienting factor in evolution},
  author={Lev Y. Yampolsky and Arlin Stoltzfus},
  journal={Evolution \& Development},
  year={2001},
  volume={3}
}
SUMMARY According to New Synthesis doctrine, the direction of evolution is determined by selection and not by “internal causes” that act by way of propensities of variation. This doctrine rests on the theoretical claim that because mutation rates are small in comparison to selection coefficients, mutation is powerless to overcome opposing selection. Using a simple population‐genetic model, this claim is shown to depend on assuming the prior availability of variation, so that mutation may act… 
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