asynapsis


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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.
The analysis of SC abnormalities at D7 (A) and D14 (B) showed that asynapsis was more frequent with IPR and CCK, whereas fragmented SC was the predominant abnormality induced by CBZ.
The same association usually happens between [X.sub.1]R and YL and one individual showed > 25% asynapsis between [X.sub.1]R and YL.
For each control and patient the numbers of pachytene nuclei showing asynapsis, fragmented SC, dotted SC and thin and non-homogeneously stained SC, and the number of pachytene nuclei showing various associations of these abnormalities were quantified.
A distinction should be made between normal meiosis-specific genes driving and regulating the meiotic process and mutated alleles leading to asynapsis or desynapsis.
Sterility in soybeans caused by asynapsis. Crop Sci.
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.