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]

diplotene

/dip·lo·tene/ (-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.

diplotene

[dip′lətēn]
Etymology: Gk, diploos + tainia, ribbon
the fourth stage in the first meiotic prophase in gametogenesis, in which chiasmata form between the chromatids of paired homologous chromosomes and crossing over occurs. The chromosomes then begin to repel each other and separate longitudinally, forming loops. See also diakinesis, leptotene, pachytene, zygotene.

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.

diplotene

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.
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.
4: Effects of CBZ, IPR and CCK on the chronology of meiosis Primary spermatocytes stained with an anti-SCP3 antibody were selected to evaluate the respective percentages of leptotene, zygotene, pachytene and diplotene stages of the meiotic prophase.
Grasshoppers do not present this problem: diplotene stages are exceptionally clear so chiasmata and twists are readily identified.
But these associations are also clearly seen in grasshopper early diplotene bivalents where terminalization could not possibly have started.
In the pholcid Mesabolivar luteus, some diplotene cells appeared in pairs, and the authors also suggested that the organization of the testicular cells was responsible for this apparent tetraploidy (Araujo et al.
These regions map all of the centromeres in the pachytene and diplotene chromosomes and are clearly positioned toward one of the poles at anaphase II (Fig.
In meiosis the process is divided into six stages: preleptotene, leptotene, zygotene, pachytene, diplotene, and diakinesis.
Keywords: Arachnida, Meiosis, chromosomal morphology, spider, diplotene pair
In relation to these grouped cells, two questions are crucial: why do they appear in pairs and not in larger groups of cells; and why do these pairs only appear in the diplotene phase?
grossum surfacespread spermatocytes reaffirmed the correlation previously found between the extent of synapsis at "pachytene" and the localization of chiasmata at diplotene, diakinesis and metaphase I (Fletcher 1977, Wallace & Jones 1978).