asynapsis


Also found in: Dictionary, Medical.

asynapsis

[‚ā·si′nap·səs]
(cell and molecular biology)
Absence of pairing of homologous chromosomes during meiosis.
References in periodicals archive ?
The predominant abnormality induced by CBZ was fragmented SC, whereas IPR and CCK induced both asynapsis and fragmented SC.
Asynapsis and nondisjunctional orientation are extremely rare.
The most frequent abnormality in patients and controls was fragmented SC, isolated or associated with asynapsis and/or dotted SC.
A distinction should be made between normal meiosis-specific genes driving and regulating the meiotic process and mutated alleles leading to asynapsis or desynapsis.
In mammals, asynapsis at late pachynema, especially involving the sex chromosomes, has been associated with germ-cell death (Burgoyne and Baker 1984; Forejt 1984; Searle 1993; Hale 1994).
Suppression of crossing over by asynapsis and nonhomologous pairing would lower the number of crossovers, thereby reducing the percentage of pollen abortion (McClintock, 1931; Maguire, 1966).
First division restitution for 2n megaspore formation normally occurs because of asynapsis or desynapsis, suggesting that the resultant 2n gametes will likely be homogeneous.