Biology and Philosophy

, Volume 11, Issue 1, pp 67–88

Evolutionary plasticity in prokaryotes: A panglossian view

Evolutionary plasticity in prokaryotes
  • Marcel Weber
Article

DOI: 10.1007/BF00127472

Cite this article as:
Weber, M. Biol Philos (1996) 11: 67. doi:10.1007/BF00127472

Abstract

Enzyme directed genetic mechanisms causing random DNA sequence alterations are ubiquitous in both eukaryotes and prokaryotes. A number of molecular geneticist have invoked adaptation through natural selection to account for this fact, however, alternative explanations have also flourished. The population geneticist G.C. Williams has dismissed the possibility of selection for mutator activity on a priori grounds. In this paper, I attempt a refutation of Williams' argument. In addition, I discuss some conceptual problems related to recent claims made by microbiologists on the adaptiveness of “molecular variety generators” in the evolution of prokaryotes. A distinction is proposed between selection for mutations caused by a mutator activity and selection for the mutator activity proper. The latter requires a concept of fitness different from the one commonly used in microbiology.

Key words

Microbial evolutiongenetic diversitygenome plasticitymutationselectionadaptationfunctionetiological conceptionfitnessenvironmental heterogeneityexpected time to extinctioncloneindividualclansubclanbacteriophageDNA inversionsite-specific recombinationsecondary crossover sitestransposition

Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Marcel Weber
    • 1
    • 2
  1. 1.BiozentrumUniversity of BaselBaselSwitzerland
  2. 2.Fachgruppe PhilosophieUniversity of KonstanzKonstanzGermany