Definición de chiasma en inglés:

chiasma

Saltos de línea: chi|asma
Pronunciación: /kʌɪˈazmə
 
, kɪ-/

sustantivo (plural chiasmata /-tə/)

1 (also optic chiasma) Anatomy The X-shaped structure formed at the point below the brain where the two optic nerves cross over each other.
Más ejemplos en oraciones
  • The dura that invests the optic chiasma can be traced from the chiasma along the optic nerve.
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.
Más ejemplos en oraciones
  • 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.

Origen

mid 19th century: modern Latin, from Greek chiasma 'crosspiece, cross-shaped mark', from khiazein 'mark with the letter chi'.

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Palabra del día anomalous
Pronunciación: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected