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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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Origin of new evolutionary lineages

Origin of new evolutionary lineages

(p.123) Chapter 7 Origin of new evolutionary lineages
Evolution through Genetic Exchange

Michael L. Arnold

Oxford University Press

This chapter examines the effects of gene exchange on the formation of new evolutionary lineages. In some cases this can be viewed as the origin of new species, in others the organisms formed from genetic exchange are given subspecific classifications. In some instances, the genetic exchange event is seen to be the basal event for entire evolutionary assemblages. Regardless of the evolutionary timing of such events and the taxonomic identity of the products, the importance remains in the outcome: that is, novelty has been produced, both in terms of new organisms and new adaptations. The chapter presents examples from a wide range of microorganismic and multicellular lineages. It highlights cases of diversification that can be placed into the categories of polyploid, homoploid, ecological, and recombinational speciation.

Keywords:   genetic exchange, new evolutionary lineages, natural hybridization, evolution, viral recombination

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