Chiasma

chiasma
a cross-shaped structure commonly observed between non-sister chromatids during meiosis; the site of crossing over
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Chiasma
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The term "Chiasma" is also sometimes used to refer to the Optic chiasm.
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Chiasmata
An X-shaped crossing formed by the crossing over of homologous chromosomes during meiosis when genetic material is exchanged.
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Chiasma
The term which Janssens (1909) introduced for the nodes (Gk. chiasma; cross) where the individual chromosomes making up each pair remain in contact during the diplotene and diakinetic stages of prophase 1 and during metaphase 1 of meiosis.
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Chiasma
A cross-over between strands of two non-sister chromatids during recombination. The junction where two homologous chromosomes appear to exchange genetic material during recombination.
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Chiasmata represent points where earlier (and unseen) nonsister chromatids had swapped sections. The process is called crossing over. It is reciprocal; the segments exchanged by each nonsister chromatid are identical (but may carry different alleles).
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chiasma The site where the exchange of chromosome segments between homologous chromosomes takes place (crossing-over) (pl.: chiasmata). PICTURE
chitin A polysaccharide contained in fungi; also forms part of the hard outer covering of insects.
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chiasma pl. chiasmata
(ky-as-muh)
The X-shaped, microscopically visible region representing homologous chromatids that have exchanged genetic material through crossing over during meiosis.
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chiasma A decussation or X-shaped crossing; the places where pairs of homologous chromatids remain in contact during late prophase to anaphase of the first meiotic division.
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chiasmata
): The points of physical overlap of
nonsister
chromatids crossing-over in meiosis.
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OpticChiasma the place where the optic nerves cross to the other side of the brain
(opti = the eye; chiasm = cross)
Organelle the "body parts" within a cell
(organum = an instrument implement engine; -elle = small) ...
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optic chiasma
a point under the hypothalamus of the brain where the two optic nerves meet and cross over, so that a stimulus from either eye is interpreted in the optic lobe of the opposite side of the brain.
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This creates a Holliday structure or half chiasma.
The branch represented by the half chiasma can migrate (3).
Resolution of the half chiasma occurs by two endonucleolytic cuts in one of two ways.
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When the chromosomes partially separate in late prophase, the areas where crossing over occurred remain attached and are referred to as Chiasmata (sing. chiasma). They hold the chromosomes together until they separate during anaphase.
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Each chromosome becomes two chromatids. The chromosomes join at several points or crosses known as chiasmata. Genetic crossing-over results. Nevertheless, the pair of chromosomes hold until anaphase.
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