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chiasma

A Dictionary of Zoology | 1999 | Copyright

chiasma (pl. chiasmata) In genetics, a cross-shaped structure that forms the points of contact between non-sister chromatids of homologous chromosomes first seen in the tetrads of the diplotene stage of meiotic prophase. Chiasmata are thus the visible expression of crossing-over of genes. There are usually one or more chiasmata per chromosome per meiosis. See also BREAKAGE AND REUNION.

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MICHAEL ALLABY. "chiasma." A Dictionary of Zoology. 1999. Encyclopedia.com. 10 Feb. 2010 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "chiasma." A Dictionary of Zoology. 1999. Encyclopedia.com. (February 10, 2010). http://www.encyclopedia.com/doc/1O8-chiasma.html

MICHAEL ALLABY. "chiasma." A Dictionary of Zoology. 1999. Retrieved February 10, 2010 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-chiasma.html

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