Polyploidy - Wikipedia, the free encyclopedia
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Polyploidy occurs in cells and organisms when there are more than two paired (homologous) sets of chromosomes. Most organisms are normally diploid, meaning they have two sets of chromosomes — one set...
en.wikipedia.org/wiki/Polyploidy
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Polyploidy in plants ... Polyploidy is very common in plants, especially in angiosperms. From 30% to 70% of today's angiosperms are thought to be polyploid. Species of coffee plant with 22, 44, 66, and 88 chromosomes are known. ... Polyploidy and Speciation...
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users.rcn.com/jkimball.ma.ultranet/BiologyPages/P/Polyp...
users.rcn.com/jkimball.ma.ultranet/BiologyPages/P/Polyploidy.html
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The most comprehensive work on polyploidy and its relationship to plant evolution is the book "Plant Speciation" by Vern Grant (1981). It has been estimated that 30% to 70% of angiosperms are polyploids (Grant, 1971). The broad range in estimates for angiosperm polyploidy is due to a lack of knowledge about whether...
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www.biology.ualberta.ca/courses.hp/biol606/OldLecs/Lect...
www.biology.ualberta.ca/courses.hp/biol606/OldLecs/Lecture2K.02.McPherson.html
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Allopatric Speciation ... Allopatric Speciation: the Role of Isolation in Speciation ... Link to a discussion of polyploidy and an example of its role in speciation.
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users.rcn.com/jkimball.ma.ultranet/BiologyPages/S/Speci...
users.rcn.com/jkimball.ma.ultranet/BiologyPages/S/Speciation.html
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is an important, though not the exclusive cause for speciation, i.e. the development of new species, in angiosperms. Studying all connected phenomena in detail is therefore important. ... In 1932, O. HAGERUP succeeded in inducing polyploidy experimentally as a result of a cold shock, but this does nevertheless seem to be...
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www.biologie.uni-hamburg.de/b-online/e37/37d.htm
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While I have not had a chance to get all the references that he has sent me, he has given me a great deal to think about over the role of symbiosis in speciation. Many thanks to all ... 5.1 Speciations Involving Polyploidy, Hybridization or Hybridization Followed by Polyploidization.;
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www.talkorigins.org/faqs/faq-speciation.html
www.talkorigins.org/faqs/faq-speciation.html
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ere is a short list of referenced speciation events. I picked four relatively well-known examples, from about a dozen that I had documented in materials that I have ... Kaneshiro, Kenneth Y. Speciation in the Hawaiian drosophila: sexual selection appears to play an important role. BioScience. V38. P258(6) April, 1988.
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www.talkorigins.org/faqs/speciation.html
www.talkorigins.org/faqs/speciation.html
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Whitham et al., 1991 ), further emphasizing the importance of polyploidy and hybridization in plant evolution. Hybridization had traditionally been viewed as unlikely to directly lead to speciation, as hybrids were considered to be evolutionarily nonviable (Dobzhansky, 1940 ;
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www.amjbot.org/cgi/content/full/91/5/707
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Summary Enormous strides have been made in the study of polyploidy over the last 20 yr. Here, we highlight some of these discoveries and note where our understanding of Following polyploidization, both genetic and epigenetic mechanisms may play an important role in altering gene expression. ... homoploid_speciation...
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www.citeulike.org/user/echinotrix/article/599539
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