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Evolution through Genetic Exchange$
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Michael L. Arnold

Print publication date: 2007

Print ISBN-13: 9780199229031

Published to Oxford Scholarship Online: April 2010

DOI: 10.1093/acprof:oso/9780199229031.001.0001

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Barriers to gene flow

Barriers to gene flow

(p.62) Chapter 4 Barriers to gene flow
Evolution through Genetic Exchange

Michael L. Arnold

Oxford University Press

This chapter considers the barriers that limit genetic exchange. The conceptual framework for this chapter assumes that specific barriers are part of a multi-tiered process. In sexually reproducing organisms, these barriers can be easily placed into the categories of pre- and postzygotic. However, even for those organisms thought to spend most of their life history reproducing asexually (e.g. bacterial species) limits to genetic exchange can be typified with this concept. Various ecological, behavioral, gametic, viability, and fertility barriers can thus isolate both ‘asexual’ and ‘sexual’ species. The chapter adopts a model in which multiple, life-history-stage-specific characteristics must be overcome for gene exchange to occur.

Keywords:   genetic exchange, gene exchange, gamete competition, fertility barriers, life history

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