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chiasma

A Dictionary of Plant Sciences | 1998 | | © A Dictionary of Plant Sciences 1998, originally published by Oxford University Press 1998. (Hide copyright information) Copyright

chiasma (pl. chiasmata) In genetics, a cross-shaped structure forming the points of contact between non-sister chromatids of homologous chromosomes, first seen in the tetrads of the diplotene stage of meiotic prophase I. 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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