noun (plural chiasmata /kʌɪˈazmətə/ /kɪˈazmətə/)
2 Biology A point at which paired chromosomes remain in contact during the first metaphase of meiosis, and at which crossing over and exchange of genetic material occur between the strands.
- A given factor s can affect the recombination rate r through a change in the number of chiasmata occurring during meiosis.
- However, the observed differences may be conditional on the chromosomal location of the chiasmata.
- First, it generates crossovers between homologous chromosomes that mature into visible chiasmata.
Mid 19th century: modern Latin, from Greek chiasma 'crosspiece, cross-shaped mark', from khiazein 'mark with the letter chi'.
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