CHIASMA
- a connection formed during meiosis, also CHIASM [n CHIASMAS or CHIASMATA]
- an anatomical junction [n CHIASMAS, CHIASMATA] : CHIASMAL [adj], CHIASMIC [adj]
- crossing or decussation, as that of the optic nerves at the base of the brain
- point of overlap of paired chromatids at which fusion and exchange of genetic material take place during prophase of meiosis
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