nuclei of both species revealed eight autosomal bivalents with one or two interstitial or terminal chiasmata, and one sex univalent, which was easily recognized due to its length and configuration (Fig.
However, this cell was absent in stages IV, while primary spermatocytes at the diplotene
and leptotene stages were only found in stages III and IV, and in stages I and II, respectively.
Chaube, "A moderate increase of hydrogen peroxide level is beneficial for spontaneous resumption of meiosis from diplotene
arrest in rat oocytes cultured in vitro," BioResearch Open Access, vol.
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).
, diacinesis y metafase I se encontraron 9II en todas las celulas analizadas (Figs.
It ends with the arrest of the meiosis division at the diplotene
The meiotic division of oocytes begins prenatally in the follicles and stops at the diplotene
stage of prophase I just before or immediately after birth.
In most mammals, oocytes are arrested at the diplotene
stage, also called the germinal vesicle stage, of the first meiotic prophase until a surge of gonadotrophins from the pituitary stimulates the immature oocytes into resuming first meiosis and ovulation .
The spg are located on the basal membrane; above these, many spcI in different stages of the meiotic prophase from preleptotene, pachytene, diplotene
until diakinesis are easily recognizable according to the aspect of thechromatin.
El nucleo ovocitario presenta un prominente nucleolo y los cromosomas en configuracion diplotene
In females, in which the primary oocytes are arrested in the diplotene
stage of meiotic prophase I, this process is initiated only after birth, during the follicular growth phase.
This latter cell gives rise to the primary spermatocyte, which quickly undergoes its first meiotic division and passes through 4 prophase stages, leptotene, zygotene, pachytene, and diplotene
, before undergoing meiotic metaphase.
In Church's (1974) words in a study of chiasma frequency in female Melanoplus femurrubrum: 'Obtaining 30 analysable cells in diplotene
is a monumental task for the following reasons.