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Polymorphism from environmental heterogeneity: models are only robust if the heterozygote is close in fitness to the favoured homozygote in each environment

Published online by Cambridge University Press:  14 April 2009

Rolf F. Hoekstra ,
R. Bijlsma  and
A. J. Dolman
Rolf F. Hoekstra
Affiliation:
Department of Genetics, University of Groningen, Centre of Biological Sciences, 9751 NN Haren, The Netherlands
R. Bijlsma
Affiliation:
Department of Genetics, University of Groningen, Centre of Biological Sciences, 9751 NN Haren, The Netherlands
A. J. Dolman
Affiliation:
Department of Genetics, University of Groningen, Centre of Biological Sciences, 9751 NN Haren, The Netherlands

Summary

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The lack of robustness of models of the maintenance of polymorphism in a heterogeneous environment which has been pointed out by Maynard Smith & Hoekstra (1980), applies also to models based on habitat selection, on temporal variation and on density-regulated selection. Only if (partial) dominance ‘switches’ between environments such that the fitness of the heterozygote is always close to the favoured homozygote, is there reasonable robustness. This is true for all models considered. It is argued that there are good reasons for supposing that the favourable allele at a locus may show dominance, although the experimental evidence is still scanty.

Type
Research Article
Information
Genetics Research , Volume 45 , Issue 3 , June 1985 , pp. 299 - 314
Copyright
Copyright © Cambridge University Press 1985

References

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