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Related to zygotene: diplotene, meiosis, synaptonemal complex
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  • noun

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the second stage of the prophase of meiosis

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Photomicrographs of the cross-sections of seminiferous tubules represent the stages of spermatogenesis of seminiferous epithelium: spermatogonia type A (short arrows), primary spermatocytes at the pachytene stage (long arrows), spermatids at the zygotene stage (ellipse area) and spermatozoa (rectangular area).
The presence of primary spermatocytes at two different stages, specifically zygotene and diplotene, with large nuclei observed in spermatocytes in the diplotene stage, was the other notable characteristic of this stage.
In control cultures, the percentages listed in Table S3 (http:// dx.doi.org/10.14573/altex.1601253s3) of the four stages of the meiotic prophase (leptotene, zygotene, pachytene and diplotene) are of the same order of magnitude as those obtained previously (Ali et al., 2014; Geoffroy-Siraudin et al., 2010, 2012).
The labelling at fully synapsed chromosomes quickly decreased in late zygotene nuclei, disappearing completely by mid to late pachytene.
The respective frequencies of the leptotene, zygotene and pachytene stages as well as the frequencies of the four substages of pachytene were evaluated.
By the time of the zygotene stage the chromosomes are fully condensed and the homologous pairs begin to line up parallel to each other.
DM "Z-Z-Zonked?" Zippy zapped zygotene. Zorro zombified zidovudine.
Bayliss and Riley (1972) concluded that temperature-induced chiasma frequency changes in wheat were caused by pairing failure at zygotene. Loidl (1989) showed more exactly that the reduced chiasma frequency in Allium ursinum L.
Studies on yeast indicate that recombination is initiated in zygotene prior to actual SC formation (reviewed in Hawley and Arbel 1993).
It then progresses through the first meiotic prophase, which consists of leptotene, zygotene, pachytene, and diplotene phases.
In the primary spermatocyte (3.1-3.6 [micro]m) is possible to see 4 stages of early prophase: leptotene, zygotene, pachytene and diplotene.