THE THEORY OF SPECIATION VIA THE FOUNDER PRINCIPLE

THE THEORY OF SPECIATION VIA THE FOUNDER PRINCIPLE The founder principle has been used to explain many instances of rapid speciation. Advances from theoretical population genetics are incorporated into MAYR’S original founder-effect genetic-revolution model to yield a newer model called the genetic transilience. The basic theoretical edifice lies upon the fact that founder event can sometimes lead to an accumulation of inbreeding and an induction of gametic disequilibrium. This, in turn, causes alleles to be selected more for their homozygous fitness effects and for their effects on a more stable genetic background. Selection occurring in multi-locus systems controlling integrated developmental, physiological, behavioral, etc., traits is particularly sensitive to these founder effects. If sufficient genetic variability exists in the founder population, such multilocus genetic systems can respond t o drift and the altered selective forces by undergoing a rapid shift to a new adaptive peak known as the genetic transilience. A genetic transilience is, therefore, most likely to occur when the founder event causes a rapid accumulation of inbreeding without a severe reduction in genetic variability. The implications of this model are then examined for three aspects of the founder-effect genetic-transilience model: the attributes of the ancestral population, the nature of the sampling process used t o http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Genetics Genetics Society of America

THE THEORY OF SPECIATION VIA THE FOUNDER PRINCIPLE

Genetics, Volume 94: 1011 – Apr 1, 1980

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Publisher
Genetics Society of America
Copyright
Copyright © 1980 by the Genetics Society of America
ISSN
0016-6731
eISSN
1943-2631
Publisher site
See Article on Publisher Site

Abstract

The founder principle has been used to explain many instances of rapid speciation. Advances from theoretical population genetics are incorporated into MAYR’S original founder-effect genetic-revolution model to yield a newer model called the genetic transilience. The basic theoretical edifice lies upon the fact that founder event can sometimes lead to an accumulation of inbreeding and an induction of gametic disequilibrium. This, in turn, causes alleles to be selected more for their homozygous fitness effects and for their effects on a more stable genetic background. Selection occurring in multi-locus systems controlling integrated developmental, physiological, behavioral, etc., traits is particularly sensitive to these founder effects. If sufficient genetic variability exists in the founder population, such multilocus genetic systems can respond t o drift and the altered selective forces by undergoing a rapid shift to a new adaptive peak known as the genetic transilience. A genetic transilience is, therefore, most likely to occur when the founder event causes a rapid accumulation of inbreeding without a severe reduction in genetic variability. The implications of this model are then examined for three aspects of the founder-effect genetic-transilience model: the attributes of the ancestral population, the nature of the sampling process used t o

Journal

GeneticsGenetics Society of America

Published: Apr 1, 1980

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