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chiasma
(redirected from chiasmatic)

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chiasma /chi·as·ma/ (ki-az´mah) pl. chias´mata   [L.] chiasm; in genetics, the points at which members of a chromosome pair are in contact during the prophase of meiosis and because of which recombination, or crossing over, occurs on separation.
chi·as·ma (k-zm) or chi·asm (kzm)
n. pl. chi·as·mas or chi·as·ma·ta (-m-t) or chi·as·ms
1. A crossing or intersection of two tracts, as of nerves or ligaments.
2. The point of contact between paired chromatids during meiosis, resulting in a cross-shaped configuration and representing the cytological manifestation of crossing over.

chi·asmal, chi·asmic, chias·matic (-mtk) adj.

chiasma
[kī·az′mə] pl. chiasmata
Etymology: Gk, lines that cross
a visible connection between homologous chromosomes during the first meiotic division in gametogenesis. Chiasmata appear as X-shaped configurations during the late prophase stage and provide the means by which homologous chromosomes exchange genetic material. See also crossing over. chiasmatic, chiasmic, adj.

chiasma [ki-az´mah] (pl. chias´mata) (L.; Gr.)
in genetics, the points at which members of a chromosome pair are in contact during the prophase of meiosis and because of which recombination, or crossing over, occurs on separation. See also chiasma formation.

chiasma
pl. chiasmata [L., Gr.] chiasm; in genetics, the points at which members of a chromosome pair are in contact during the prophase of meiosis and because of which recombination, or crossing over, occurs on separation.

chiasma formation
the process by which a chiasma is formed; it is the cytological basis of genetic recombination, or crossing over.
chiasma syndrome
optic atrophy with bilateral hemianopia.


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Chiasmatic and hypothalamic gliomas (Figure 23) are seen predominantly in the first decade of life and 20-50% of these patients have neurofibromatosis I.
The clock is actually a small cluster of nerves known as the supra chiasmatic nucleus or SCN.
This chiasmatic equation of texts to individuals and individuals to texts is the embryonic principle of the autobiographical tradition in African American letters.
 
 
 
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