define chismata of meiosis first
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chiasmata) is the point of contact, the physical link, between two (non-sister) chromatids belonging to homologous chromosomes. ... The chiasmata become visible during the diplotene stage of prophase I of meiosis, but the actual "crossing-overs" of genetic material are thought to occur during the previous pachytene stage.
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chiasma (pl. chiasmata)The point at which paired homologous chromosomes remain in contact as they begin to separate during the first prophase of meiosis, forming a cross shape. A number of chiasmata can usually be identified and at these points crossing over occurs.
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