diplotene


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diplotene

 [dip´lo-tēn]
the stage of the first meiotic prophase, following the pachytene, in which the two chromosomes in each bivalent begin to repel one another and a split occurs between the chromosomes.

dip·lo·tene

(dip'lō-tēn),
The late stage of prophase in meiosis in which the paired homologous chromosomes begin to repel each other and move apart, but are usually held together by chiasmata. The chiasmata are associated with breakage of two chromatids at corresponding points followed by refusion of the broken ends with exchange of segments between the chromatids; this is considered to be the cytologic basis for the crossing-over of genes.
[diplo- + G. tainia, band]

dip·lo·tene

(dip'lō-tēn)
The late stage of prophase in meiosis in which the paired homologous chromosomes begin to repel each other and move apart.
[diplo- + G. tainia, band]

diplotene

a stage of MEIOSIS near the end of Prophase 1, in which the CHROMATIDS become separated (except at the CHIASMATA), and the chromosomal material is contracting. The chiasmata indicate that CROSSING OVER is taking place.
References in periodicals archive ?
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.
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. 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 stage.
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.