diakinesis


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di·a·ki·ne·sis

 (dī′ə-kə-nē′sĭs, -kī-)
n. pl. di·a·ki·ne·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

(ˌdaɪəkɪˈniːsɪs; -kaɪ-)
n
(Zoology) the final stage of the prophase of meiosis, during which homologous chromosomes start to separate after crossing over
[C20: from dia- + Greek kinēsis movement]

diakinesis

the final stage of prophase prior to the dissolution of the nuclear membrane. — diakinetic, adj.
See also: Biology
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.diakinesis - the final stage of the prophase of meiosis
prophase - the first stage of meiosis
phase, stage - any distinct time period in a sequence of events; "we are in a transitional stage in which many former ideas must be revised or rejected"
References in periodicals archive ?
1964), and 100 well-spread diakinesis metaphase I cells were analyzed per animal to assess aberrations in five mice/group.
Table 2--Meiotic chromosome configurations at diakinesis and metaphase I and mode of reproduction of Paspalum.
At the stage of diakinesis (end of prophase I), when fully cellularized oocytes are positioned in a single continuous row in wild-type worms, we also detected unevenly spaced nuclei, suggesting a defect in cytokinesis (white arrows).
In all samples the karyotypes were obtained by counting the chromosomes of at least seven of the better metaphases (and diakinesis in males) for individual, by arranging and qualifying the chromosomes according to Levan et al.
In meiotic cells, from leptotene to diakinesis stages, the X chromosome shows positive heteropycnosis, and is usually located outside the autosomal chromatin mass (Fig.
In a comprehensive study of 33 species of the Eumastacid subfamilies Thericleinae and Euschmidtiinae from Africa (White 1965a), a number of meiotic peculiarities unique to Thericleinae were disclosed for the first time: in the majority of species, classic diplotene and diakinesis are omitted in male meiosis, and chiasmata only appear at early or midmetaphase I; the latter species are 'cryptochiasmate'.
In the present hybrids, evaluation of the chromosome pairing at diakinesis (Figure 1a) revealed that quadrivalents occur, but in low frequency, ranging from one to three.
During diakinesis, diploid chromosomes associate in bivalents; in triploids, univalents, bivalents, and trivalents are formed; and in tetraploids, univalents, bivalents, trivalents, and quadrivalents are formed.
During the early prophase, the sex chromosomes X and Y are positively heteropycnotic and remain in this condition until diakinesis.
The study was carried out through analysis of meiocytes in diakinesis and metaphase I, based on the meiotic configuration frequency.