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Chiasma (plural: chiasmata): structures shaped like the Greek letter χ (usually Romanized as chi but pronounced “kai”) that form between non-sister chromatidsplugin-autotooltip__default plugin-autotooltip_bigNon-sister chromatids: Chromatids that are derived from two different chromosomes in a homologous chromosome pair during meiosis I. See also: sister chromatids. during meiosis Iplugin-autotooltip__default plugin-autotooltip_bigMeiosis I: the first cell division of meiosis. Crossing over occurs during Meiosis I.. Chiasmata is the physical manifestation of crossing overplugin-autotooltip__default plugin-autotooltip_bigCrossing over: an event where non-sister chromatids exchange material with each other during meiosis I..