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diplotene
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diplotene
diplotene Biol. (ˈdɪpləʊtiːn) [ad. Fr. diplotène (H. von Winiwarter 1900, in Archives de Biol. XVII. i. 70), f. diplo- + -tene.] The fourth stage of the prophase of meiosis (following pachytene), in which the four chromatids of each tetrad begin to separate into two pairs, each pair containing one c...
Oxford English Dictionary
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Bivalent (genetics)
This physical strand exchange and the cohesion between the sister chromatids along each chromosome ensure robust pairing of the homologs in diplotene phase This physical strand exchange and the cohesion between the sister chromatids along each chromosome ensure robust pairing of the homologs in diplotene phase
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strepsitene
† strepsitene Cytology. Obs. [ad. F. strepsitène (V. Grégoire 1907, in La Cellule XXIV. 372), f. strepsinema: see -tene.] = strepsinema.1911 Q. Jrnl. Microsc. Sci. LVII. 14 Following immediately after the bouquet is the strepsitene or diplotene stage, in which the conjugants which were temporarily u...
Oxford English Dictionary
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Karyosome
In insects this occurs in the diplotene stage, a prolonged segment that crosses over genes from two different cells, and aids in the creation of gametes
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amphitelic
amphitelic, a. Cell Biol. Brit. /ˌamfɪˈtɛlɪk/, U.S. /ˌæm(p)fəˈtɛlɪk/ [‹ amphi- prefix + ancient Greek τέλος end, completion (see telos n.) + -ic suffix (compare telic adj.), after German amphitel (H. Bauer et al. 1961, in Chromosoma 12 163).] Designating or exhibiting attachment of sister kinetochor...
Oxford English Dictionary
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Chiasma (genetics)
The chiasmata become visible during the diplotene stage of prophase I of meiosis, but the actual "crossing-overs" of genetic material are thought to occur Chiasma frequency was scored at the later diplotene-diakinesis stages of meiosis.
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postsynapsis
† postsyˈnapsis Cytology. Obs. [post- B. 1 c.] (See quots.)1898 T. H. Montgomery in Zool. Jahrbücher: Anat. u. Ontogenie XI. 20 The anaphase itself may be subdivided into 3 well marked periods: the early anaphase, the synapsis, and the postsynapsis. Ibid. 28 The postsynapsis, a term introduced here ...
Oxford English Dictionary
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Prophase
Many species arrest meiosis in diplotene of prophase I until ovulation. Diplotene
In the fourth phase of prophase I, diplotene (from the Greek for "twofold"), crossing-over is completed.
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strepsinema
† strepsinema Cytology. Obs. [f. Gr. στρεψι-, comb. form of στρέϕειν to twist + νῆµα yarn.] A condition of the nucleus during cell division, characterized by pairs of chromosomes twisted around one another or in the form of twisted rings; in most cases applied to diplotene nuclei.1900 H. H. Dixon in...
Oxford English Dictionary
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BRD7
Azoospermia
BRD7 protein is a transcription regulator that is normally highly expressed in the testis, particularly in meiotic pachytene and diplotene
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postsynaptic
postsyˈnaptic, a. 1. Cytology. [post- B. 1 b.] Subsequent to meiotic synapsis.1909 [see presynaptic a. 1]. 1912 Jrnl. Exper. Zool. XIII. 377 (heading) The post-synaptic spireme. Pachytene and diplotene. 1921 Ann. Bot. XXXV. 366 During the period when the mother-cells are in synapsis and the postsyna...
Oxford English Dictionary
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Leptotene stage
From mid-pachytene to diplotene the predominant DNA repair pathway is non-homologous end joining.
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terminalization
terminalization Cytology. (ˌtɜːmɪnəlaɪˈzeɪʃə n) [f. terminal a. and n. + -ization.] The movement of a chiasma or chiasmata towards the end of a separating bivalent.1929 C. D. Darlington in Jrnl. Genetics XXI. 266 The post-diplotene stages in this species are characterised by a regular movement of ch...
Oxford English Dictionary
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Resumption of meiosis
The main arrest occurs during the diplotene stage of prophase 1, this arrest lasts until puberty. At birth, meiosis arrests at the diplotene phase of prophase I. Oocytes will remain in this state until the time of puberty.
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prophase
prophase Cytology. (ˈprəʊfeɪz) [ad. G. prophase (E. Strasburger 1884, in Arch. f. mikrosk. Anat. XXIII. 250): see pro-2 and phase.] The first stage in a mitotic or meiotic nuclear division, preceding prometaphase, during which the chromosomes become visible and shorten and the nuclear envelope disap...
Oxford English Dictionary
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