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Achiasmate meiosis refers to meiosis without chiasmata, which are structures that are necessary for recombination to occur and that usually aid in the segregation of non-sister homologs. The pachytene stage of prophase I typically results in the formation of chiasmata between homologous non-sister chromatids in the tetrad chromosomes that form. The formation of a chiasma is also referred to as crossing over. When two homologous chromatids cross over, they form a chiasma at the point of their intersection. However, it has been found that there are cases where one or more pairs of homologous chromosomes do not form chiasmata during pachynema. Without a chiasma, no recombination between homologs can occur.
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