1. Plural of chiasma; points where paired chromosomes cross over and exchange genetic material during meiosis.
Usage: biology; genetics; technical
2. Plural of chiasma; an X-shaped anatomical structure, especially the optic chiasma where the optic nerves cross in the brain.
Usage: anatomy; medical; technical

Examples

• During meiosis, chiasmata form where homologous chromosomes exchange segments of DNA.
• The formation of chiasmata is essential for genetic recombination in sexual reproduction.
• Biologists observe chiasmata under a microscope to study chromosome behavior.
• The optic chiasmata in the brain allow visual information from both eyes to be processed.
• Damage to the chiasmata can result in vision problems affecting both eyes.