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Polyploidy in animals ... Polyploidy is much rarer in animals. It is found in some insects, fishes, amphibians, and reptiles. Until recently, no polyploid mammal was known. However, the 23 September 1999 issue of Nature reports that a polyploid (tetraploid;
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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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In animals a few instances of polyploidy are known in parthenogenetic forms (for example, in the Crustaceans Artemia1 and Trichoniscus2, the moth Solenobia3 and some of the weevils4).
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www.nature.com/nature/journal/v146/n3691/abs/146132a0.h...
www.nature.com/nature/journal/v146/n3691/abs/146132a0.html
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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.
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www.citeulike.org/user/BioNica/article/599516
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Muller raised the possibility that the sex chromosomes serve as a barrier to polyploidy in most animals. Plants, by contrast, do not usually have sex ...
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www.bookrags.com/research/polyploidy-gen-03/
www.bookrags.com/research/polyploidy-gen-03/
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As pointed out earlier, polyploidy in sexually reproducing animals is rare. The ... Most of the polyploids that have become established in animals in nature ...
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www.maizegdb.org/ancillary/Burnham/ch7p179to184.pdf
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Their method of cell division is different frm that of animals. Hence when the cell wall ( more complex and tougher than free cell membrane division) fails to form between the daughter nuclei it results in polyploidy.
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answers.yahoo.com/question/index?qid=20081015024715AAHf...
answers.yahoo.com/question/index?qid=20081015024715AAHfLYz
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I am terribly underinformed and have not kept up, but here is a long shot . . . It is certainly true that animals (and surely plants, but I don't know this directly) produce *many* mutations which do not survive embryogenesis and/or early life. ... Previous message: Plants tolerate polyploidy more readily than animals...
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www.bio.net/hypermail/btk-mca/1998-April/001711.html
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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. ... `Why polyploidy is rarer in animals than in plants': myths and mechanisms...
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www.ingentaconnect.com/content/bsc/bij/2004/00000082/00...
www.ingentaconnect.com/content/bsc/bij/2004/00000082/00000004/art00006
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Although polyploidy in animals is believed to disrupt the balance of X chromosome relative to gene products normally maintained by dosage compensation, disomy for the sex chromosomes in T. barrerae is thought to be either sufficient or the only possibility for a functional tetraploid eutherian to exist.
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www.intl-pag.org/pag/8/abstracts/pag8374.html
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