diakinesis


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diakinesis

 [di″ah-kĭ-ne´sis]
the stage of first meiotic prophase, in which the nucleolus and nuclear envelope disappear and the spindle fibers form.

di·a·ki·ne·sis

(dī'ă-ki-nē'sis),
Final stage of prophase in meiosis I, in which the chiasmata present during the diplotene stage disappear, the chromosomes continue to shorten, and the nucleolus and nuclear membrane disappear.
[G. dia, through, + kinēsis, movement]

diakinesis

/di·a·ki·ne·sis/ (di″ah-kĭ-ne´sis) the stage of first meiotic prophase in which the nucleolus and nuclear envelope disappear and the spindle fibers form.

diakinesis

(dī′ə-kə-nē′sĭs, -kī-)
n. pl. diakine·ses (-sēz)
The final stage of the prophase in meiosis, characterized by shortening and thickening of the paired chromosomes, formation of the spindle fibers, disappearance of the nucleolus, and degeneration of the nuclear membrane.

di′a·ki·net′ic (-nĕt′ĭk) adj.

diakinesis

[dī′əkinē′sis, dī′əkī-]
Etymology: Gk, dia + kinesis, motion
the final stage in the first meiotic prophase in gametogenesis, in which the chromosomes achieve their maximum thickness. The chiasmata and nucleolus disappear, the nuclear membrane degenerates, and the spindle fibers form in preparation for the formation of dyads. See also diplotene, leptotene, pachytene, zygotene.

di·a·ki·ne·sis

(dī'ă-ki-nē'sis)
Final stage of prophase in meiosis I, in which the chromosomes continue to shorten and the nucleolus and nuclear membrane disappear.
[G. dia, through, + kinēsis, movement]

diakinesis

One of the stages in the process of division of eggs and sperms which ensures that the number of CHROMOSOMES is halved (meiosis). In diakinesis the chromosomes shorten and thicken and the spindle fibres form, ready for the separation of the chromosomes.

diakinesis

the final stage in Prophase I of MEIOSIS where the chromosomes reach maximum contraction with the HOMOLOGOUS CHROMOSOMES tending to separate from each other. The NUCLEOLUS disappears, the nuclear membrane degenerates and a spindle is formed of microtubules produced by the CENTROSOMES.

diakinesis

in cell division the stage of first meiotic prophase, in which the nucleolus and nuclear envelope disappear and the spindle fibers form.
References in periodicals archive ?
Because the medial element most frequently remains as a univalent at diakinesis, aneuploidy of at least 31.
Configurations observed at diakinesis were consistent with the SC analyses.
strictum, revealed that the B chromosomes were detected in the metaphase I and anaphase I, but they were absent in the diakinesis.
Indirect evidence of recombinogenic Y-specific regions is available from an XY/XYY mosaic common shrew (Sorex araneus), in which an interstitial chiasma was observed in a YY bivalent from an XYY cell at late diplonema/ early diakinesis (Searle and Wilkinson, 1986).
1995) found n=5, which doesn't agree with the cited authors and with our results presented in table 1, where bivalent associations of chromosomes in diakinesis (n=10) can be observed, therefore the studies accessions possess 2n=20, in this study considered diploid, even though discussion suggest that this is the probable tetraploid level.
In the studied accessions from Pterocaulon polystachyum (Table 1), the following were observed: 9 bivalent chromosomes (II) in diakinesis and metaphase 1 (Figure 1e, 1f), and normal chromosomal segregation in anaphase and telophase I and II (9-9), even though some irregularities occurred, like a telophasic bridge (Figure 1g) and a retarding chromosome in one cell.
The species apparently is a segmental allotetraploid because its chromosomes typically pair as one or two quadrivalents and 16 or 14 bivalents during diakinesis of meiosis I.
They reported enneavalent (association of three trivalents), hexavalent, pentavalent, and quadrivalent configurations at diakinesis or Metaphase I.
Ile anthers at diakinesis or metaphase I were hydrolyzed in 1M HCl for 5 min at WC, rinsed in distilled water then placed in a drop of 2% (w/v) acetocarmine.
Cytological observation of multivalents at diakinesis and metaphase I indicated that the two cultivars differ by at least one reciprocal chromosome interchange (Leach, 1989).
Consequently, much of the data in Table 2 for this species was obtained from cells at diakinesis.