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 ?
For Derrida, it is the chiasmic exchange by which he would force Levinas to recognize the seriasure of the feminine in an ethics that depends on her: "SHE DOESN'T SPEAK THE UNNAMEABLE YET YOU HEAR HER BETTER THAN ME AHEAD OF ME AT THE VERY MOMENT WHERE NONETHELESS ON THE OTHER SIDE OF THE MONUMENTAL WORK I WEAVE MY VOICE SO AS TO BE EFFACED THIS TAKE IT HERE I AM EAT--GET NEARER--IN ORDER TO GIVE HIM/HER--DRINK" (47).
The chiasmic figure that graces the cover is a fine illustration of the complex musings on complexion, class, and classification contained in McClendon's readings of Plum Bun (1929), Comedy American Style (1933), Quicksand (1928), and Passing (1929).
Further, the morphology of the paired units is chiasmic, in the first, "old-teen-young-old," in the second, "black-white-white-black.
763), or we can appreciate it on its own terms as a well-crafted oeuvre, written, says its author, "to share [his] pleasures and discoveries in the simplest manner possible," preferring "the lightly allusive, elliptically implicit" to the "global, tightly chiasmic analysis.
Cortical VEPs are useful for detecting abnormal cortical projections due to chiasmic misrouting including albinism (ocular and oculocutaneous) and achiasmia.
This is not merely a matter of the failure of will; the chaotic nature of nature itself, in this transformative moment, shifts tragedy into chiasmic irony.
This chiasmic relation between material states and what are traditionally perceived to be epiphenomenal states also beguiles philosophers of language in the period who are working on the problem as if it were from the other side, from models of material language that may reflect on the mind.
I was similarly eager for further comment on the chiasmic relations between high and popular culture, not least because what fascinates about this study is its account of how a body of pamphlet writing, marginal to mainstream literary and intellectual culture, came to have a dominant influence on Irish writing by the turn of the century and into the years of new Free State.
The very description of the extralinguistic body", she notes, "allegorises the problem of the chiasmic relation between language and body and so fails to supply the distinction it seeks to articulate" (2001: 257).
Between the stanzas there is an extraordinary mirroring of two two-line chiasmic structures, creating a double chiasmus as a concatenation:
Elizabeth Kraft, "Laurence Sterne and the Ethics of Sexual Difference: Chiasmic Narration and Double Desire"
The arrangement of terms in 5cd is probably chiasmic, so that in d the first term, svadha "inherent force," represents a female principle and the second, prayati "offering,"(49) a male principle.