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leptotene

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leptotene
leptotene Cytology. (ˈlɛptəʊtiːn) [ad. F. leptotène (H. von Winiwarter 1900, in Arch. de Biol. XVII. 55): see lepto- and -tene.] The first stage of the prophase of the first meiotic division, in which the chromosomes are apparent as fine slender threads. Also attrib. or as adj.[1900 Jrnl. R. Microsc... Oxford English Dictionary
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Leptotene stage
The leptotene stage, also known as the leptonema, is the first of five substages of prophase I in meiosis. A cell destined to become a gamete enters the leptotene stage after its chromosomes are duplicated during interphase. wikipedia.org
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leptonema
leptonema, n. Cytol. (lɛptəʊˈniːmə) [a. F. leptonema (coined by V. Grégoire 1907, in La Cellule XXIV. 371): see lepto-, *-nema.] = leptotene n.1911 Q. Jrnl. Microsc. Sci. LVII. 8 For the various stages of the prophase I have used the nomenclature now generally adopted, based on that proposed by von ... Oxford English Dictionary
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LINC complex
These include nuclear relocation/movement, moving meiotic chromosomes to find their homologues at leptotene/zygotene, attaching the centrosome to the outer wikipedia.org
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pachytene
pachytene Cytology. (ˈpækɪtiːn) [ad. F. pachytène (H. von Winiwarter 1900, in Arch. de Biol. XVII. i. 63): see pachy- and -tene.] The third stage of the first meiotic prophase, following zygotene, during which the paired chromosomes shorten and thicken, the two chromatids of each separate, and excha... Oxford English Dictionary
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Chromomere
The chromomeres are present during leptotene phase of prophase I during meiosis. They appear as dense granules during leptotene stage There are more than 2000 chromomeres on 20 chromosomes of maize. wikipedia.org
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zygotene
zygotene Cytology. (ˈzaɪgəʊtiːn) [a. F. zygotène (V. Grégoire 1907, in La Cellule XXIV. 371): see zygo- and -tene.] The second stage of the prophase of meiosis, following leptotene, during which homologous chromosomes begin to pair.1911 Jrnl. Morphol. XXII. 752 This view..goes on to show that after ... Oxford English Dictionary
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Chiasma (genetics)
Irradiation during the leptotene-zygotene stages of meiosis, that is, prior to the pachytene period in which crossover recombination occurs, was found wikipedia.org
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presynaptic
presyˈnaptic, a. 1. Cytology. [pre- B. 1.] Prior to meiotic synapsis.1909 Ann. Bot. XXIII. 21 In common with Grégoire ('07), we may adopt, provisionally at least, the following scheme of phases for convenience of clearness in description. The prophases of division naturally fall into two periods, th... Oxford English Dictionary
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Eyprepocnemis plorans
The autosomal chromosomes are transcriptionally active during the leptotene to zygotene stages of meiosis, whereas the X chromosome is inactive throughout wikipedia.org
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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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FANCD2
In the non-mutant mouse, FANCD2 is expressed in spermatogonia, pre-leptotene spermatocytes, and in spermatocytes in the leptotene, zygotene and early pachytene wikipedia.org
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X-irradiation
X-irradiˈation [f. X rays + irradiation.] a. Irradiation with X-rays. b. X-rays, X-radiation.1956 Nature 11 Feb. 287/1 A visible coloration is produced upon X-irradiation of the above silver-free base glass. 1962 O. Hockwin in A. Pirie Lens Metabolism Rel. Cataract 422 The application of a high dose... Oxford English Dictionary
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卵子生成
老鼠的卵母细胞进入核网期之后会主动进行DNA的修复，但在核网期之前的细线期(leptotene)、偶线期(zygotene)及粗线期(pachytene)都侦测不到。在这些初级卵母细胞继续进入月经周期时，会形成四分体同时发生联会，使得染色体交换发生。 wikipedia.org
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Bivalent (genetics)
In most organisms, each replicated chromosome (composed of two identical sisters chromatid) elicits formation of DNA double-strand breaks during the leptotene for the homologous target, helped by numerous proteins collectively referred as the synaptonemal complex, cause the two homologs to pair, between the leptotene wikipedia.org
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