<cell biology> Junction points between nonsister chromatids at the first diplotene of meiosis, the consequence of a crossing over event between maternal and paternally derived chromatids.
A chiasma also serves a mechanical function and is essential for normal equatorial alignment at meiotic metaphase I in many species. Frequency of chiasmata is very variable between species.
(05 Jan 1998)
Chiari's disease, Chiari's net, Chiari's syndrome, chiasm < Prev | Next >
chiasma opticum, chiasmapexy, chiasma syndrome
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