When non-sister chromatids from the homologous chromosome break and rejoin they do so at exactly corresponging sites, so that a cross-shaped structure called chiasma.
chiasma
Chiasma - The microscopically visible site where crossing over has occurred between chromatids of homologous chromosomes during prophase I of meiosis.
Chiasmata is the plural of chiasma. They both describe the point of crossover between the maternal and paternal chromosomes.
Optic Chiasma
A structure that holds together homologues during crossing over
chiasma
Chiasma - The microscopically visible site where crossing over has occurred between chromatids of homologous chromosomes during prophase I of meiosis.
Alt. of Chiasma
Chiasmata is the plural of chiasma. They both describe the point of crossover between the maternal and paternal chromosomes.
Optic Chiasm - a crossing point of the optic nerves.
On average, one chiasma is equal to 50 centiMorgans of genetic distance.
optic chiasma
Optic Chiasma
forebrain
chiasma occurs in meiosis. Fascinating that I didn't answer this question but it's attributed to me so I guess I'll add some detail. Chiasma means crossing/intersecting and are the points where recombination occurs duting meoisis. (Crossing over does not occur in mitosis). Chiasma(singular) or chiasmata (plural) are formed during prophaseof meiosis I duing recombination and hold homologous chromosomes together at the sites where the exchanges of genetic material occur. These "connections: remain in place until until the chromosomes seperate during anaphase.
chiasma
An Optic Tract is the pathway between the optic chiasma and the brain.