The second blockade of the first meiotic prophase appeared before the diplotene
stage, as the frequency of these nuclei did not increase at D14 in treated samples, unlike the nuclei in the control experiment.
(1976) chiasma terminalization is 'a progressive shift between diplotene
and metaphase I in the distribution of chiasmata along the arms of bivalents from their points of origin to more distal positions'.
As the behavior between XR and Y during diplotene
and diakinesis are different in the species of both genera, it seems that the X-A fusion has occurred independently in two ancestral species of each genus.
armiger (number of analyzed diplotene
plates = 378).
It then progresses through the first meiotic prophase, which consists of leptotene, zygotene, pachytene, and diplotene
In the primary spermatocyte (3.1-3.6 [micro]m) is possible to see 4 stages of early prophase: leptotene, zygotene, pachytene and diplotene
. Secundary spermatocytes (2.3-2.9) are spherical in shape.
It is reported that Ku proteins are downregulated in early meiotic cells, but are again expressed in late pachytene and diplotene
spermatocytes, and they mediate repair proficiency in somatic cells of the testis, thereby assuring the fidelity of spermatogenesis [11-13].
In the prophase of first meiotic division, the large majority of diplotene
stages show XR and Y in contact at the distal end (Fig.
Se distingue en el citosol un notorio cuerpo vitelino o de Balbiani, con numerosas vacuolas a su alrededor, mientras que, en el interior del nucleo se observan los cromosomas en diplotene
con configuracion Lumpbrush (Fig.
This phase of meiosis is completed only to the diplotene
Primary oocyte growth (size ~ 25-270 [micro]m): The first phase of oocyte growth starts with the arrest of meiosis in diplotene
. At this moment, the nucleus is spherical and in a central position.