UW-Madison BOTANY 940 - Biological relevance of polyploidy - ecology to genomics (14 pages)

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Biological relevance of polyploidy - ecology to genomics



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Biological relevance of polyploidy - ecology to genomics

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Lecture Notes


Pages:
14
School:
University of Wisconsin, Madison
Course:
Botany 940 - Seminar in Plant Systematics and Evolution
Seminar in Plant Systematics and Evolution Documents

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Blackwell Science LtdOxford UKBIJBiological Journal of the Linnean Society0024 4066The Linnean Society of London 2004August 2004 824 453466 Review Article MYTHS AND MECHANISMS B K MABLE Biological Journal of the Linnean Society 2004 82 453 466 With 3 figures Biological relevance of polyploidy ecology to genomics Edited by A R Leitch D E Soltis P S Soltis I J Leitch and J C Pires Why polyploidy is rarer in animals than in plants myths and mechanisms B K MABLE Department of Botany University of Guelph Guelph Ontario Canada N1G 2W1 Received 20 May 2003 accepted for publication 5 January 2004 Although polyploidy has been involved in speciation in both animals and plants the general perception is often that it is too rare to have been a significant factor in animal evolution and its role in plant diversification has been questioned These views have resulted in a bias towards explanations for what deters polyploidy rather than the somewhat more interesting question of the mechanisms by which polyploidy arises and becomes established in both plants and animals The evidence for and against some of the traditional views on polyploidy is reviewed with an attempt to synthesize factors promoting evolution through genome duplication in both groups It is predicted that polyploidy should be more common in temperate than in tropical breeders because environmental fluctuations may promote unreduced gamete formation it should be most common in organisms with sufficient numbers of gametes that random meiotic problems can be overcome and it should be more frequent when mechanisms to promote assortative mating are a direct byproduct of genome duplication 2004 The Linnean Society of London Biological Journal of the Linnean Society 2004 82 453 466 ADDITIONAL KEYWORDS allopolyploidy amphibians autopolyploidy minority cytotype exclusion multiple origins sex determination triploid bridge unreduced gametes INTRODUCTION The study of polyploidy in both plants and animals has been strongly



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