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Consequences of gene flow in spatially structured populations

Published online by Cambridge University Press:  01 February 1997

KATRINA A. LYTHGOE
KATRINA A. LYTHGOE
Affiliation:
Institute of Cell, Animal and Population Biology, King's Buildings, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK
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Abstract

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A simple model of migration between two populations, each in a balance between mutation and stabilizing selection on a polygenic trait, is explored. Below a critical migration rate, genetic differences between the two populations can be maintained, even if the populations are selected towards the same phenotypic optimum. Gene flow then maintains genetic variance within each population. For this process to account for heritable variation, there must be some mechanism that causes divergence. The possibility that fluctuating selection could lead to the initial differentiation of the populations is explored.

Type
Research Article
Information
Genetics Research , Volume 69 , Issue 1 , February 1997 , pp. 49 - 60
Copyright
© 1997 Cambridge University Press