chiasma

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chiasma

(kīăz`mə): see crossing overcrossing over,
process in genetics by which the two chromosomes of a homologous pair exchange equal segments with each other. Crossing over occurs in the first division of meiosis. At that stage each chromosome has replicated into two strands called sister chromatids.
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chiasma

[kī′az·mə]
(anatomy)
A cross-shaped point of intersection of two parts, especially of the optic nerves.
(cell and molecular biology)
The point of junction and fusion between paired chromatids or chromosomes, first seen during diplotene of meiosis.
References in periodicals archive ?
In The Tree of Life, the juxtaposition of trees and water exemplify the chiasm of visibility and tactility; the shared 'flesh' of the world, that is, the element of the world's shared visibility and sensibility constitutes a connected world through which pulses the contradictory but connected ways of nature and grace.
The Tree of Life captures the insignificant singularity of one small family, and its eternal significance, because Jack and his mother and father repeat the connected chiasm of galaxies and dinosaurs, and because their unique and tiny lament at the loss of their brother and son is remembered and reconciled, eternally, on the rolling waves of God's forgiving grace.
43) Though Deleuze is often thought to critique the phenomenology of Merleau-Ponty, the latter's notions of chiasm and flesh can be aligned with a Deleuzian ontology rather easily.
Complex chiasms appear in many different structural shapes in the Bible, and one of the most basic forms is the chiastic inclusion, or ABA.
Apart from the parallelisms Shakespeare uses for building blocks in this short speech, he frequently composes complex chiasms that operate on multiple structural levels simultaneously.
The repetition of the key phrases "this word 'sallet'" and "the word 'sallet,'" along with "many a time" and "many a time," forms the structural spine of the overall system, but these phrases lack the imagination and variation of later chiasms and merely meet the basic requirements of the structural form.
While Shakespeare writes complex chiasms in this form throughout all his plays, it is important to recognize that the earliest texts still contain a higher frequency of complex chiastic systems written with this regimented approach.
The final portion of this speech also happens to be another chiasm, which balances the opening chiasms in lines 175-76:
Next, by expanding each chiastic level with phrases composed of chiasms and periodic sentences (the outline of this passage generally follows the periodic sentences it contains), the full speech subsequently takes shape into a highly complex and interrelated passage:
13) Shakespeare incorporates periodic sentences of various lengths into his complex chiasms to assist in the narrative flow.