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Related Experiment Videos

One selectionist's perspective.

B Wallace1

  • 1Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg 24061.

The Quarterly Review of Biology
|June 1, 1989
PubMed
Summary
This summary is machine-generated.

This study partitions natural selection

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Area of Science:

  • Evolutionary biology
  • Population genetics

Background:

  • Questions the validity of genetic load and Haldane's "cost of natural selection."
  • Introduces a new framework for understanding selection's role in gene frequency changes.

Purpose of the Study:

  • To partition the role of selection on gene frequencies into population and time arenas.
  • To re-evaluate the significance of genetic variation discussions within these arenas.

Main Methods:

  • Defines the "population arena" as a geometric plane considering fitness across various situations within a generation.
  • Defines the "time arena" as a sequence of population arenas, focusing on average fitness over time.
  • Distinguishes between gene action (population arena) and gene structure (time arena).

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Main Results:

  • The population arena addresses genotype fitnesses and norms of reaction.
  • The time arena focuses on the temporal sequence of average relative fitnesses, including molecular changes like amino acid and base-pair substitutions.
  • Highlights that discussions on genetic variation reasonable in the population arena may not be in the time arena.

Conclusions:

  • The function-structure dichotomy is linked to the neutralist-selectionist debate.
  • Reinterprets the significance of genetic variation discussions based on the population vs. time arena framework.
  • Suggests a nuanced view of genetic variation and selection is needed.