Chromosomal polymorphism

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Polymorphism is a general concept in biology, referring to a more than one version of a trait being actively present in a population. Chomosomal polymorphism refers to the condition where one species contains members with varying chromosome counts or shapes. In most cases, the difference in chromosome counts is the result of a single chromosome undergoing fission, where it splits into two smaller chromosomes, or two undergoing fusion, where two chromosomes join to form one.

This condition has been detected in many species. Trichomycterus davisi, for example, is an extreme case where the polymorphism was present within a single chimeric individual.[1]

It has also been studied in alfalfa,[2] shrews,[3] Brazilian rodents,[4] and an enormous variety of other animals and plants.[5]

[edit] References

  1. ^ Borin, Luciana Andreia, Isabel Cristina Martins-Santos (September 2000). "Intra-individual numerical chromosomal polymorphism in Trichomycterus davisi (Siluriformes, Trichomycteridae) from the Iguaçu River basin in Brazil". Genet. Mol. Biol. 23 (3). DOI:10.1590/S1415-47572000000300018. Retrieved on 2006-12-08.
  2. ^ Bauchan,, Gary R., T. Austin Campbell, and M. Azhar Hossain (2002). "Chromosomal Polymorphism as Detected by C-Banding Patterns in Chilean Alfalfa Germplasm". Crop Sci. 42: 1291–1297.
  3. ^ http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=8999000&dopt=Abstract
  4. ^ http://www.scielo.br/scielo.php?pid=S0100-84551997000100001&script=sci_arttext&tlng=En
  5. ^ http://scholar.google.com/scholar?q=chromosomal+polymorphism&ie=UTF-8&oe=UTF-8&hl=en&btnG=Search
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