leptotenen.
/ˈlɛptə(ʊ)tiːn/, U.S. /ˈlɛptəˌtin/ Cytology.
The first stage of the prophase of the first meiotic division, in which the chromosomes are apparent as fine slender threads. Also attributive or as adj.
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the world > life > biology > biological processes > genetic activity > [noun] > stages of mitosis or meiosis
resting stage1810
prophase1884
anaphase1887
metaphase1887
synapsis1895
telophase1895
maturation division1896
postsynapsis1898
strepsinema1900
synizesis1905
interkinesis1906
pachynema1909
telosynapsis1909
leptonema1911
metasyndesis1911
strepsitene1911
zygonema1911
zygotene1911
leptotene1912
pachytene1912
interphase1913
telosyndesis1920
prometaphase1931
dictyotene1957
dictyate1958
1900 Jrnl. Royal Microsc. Soc. 654 The reticulum gives rise to a chromatic thread.., which at first fills the nuclear cavity (leptotænic stage).]
1912 Jrnl. Exper. Zool. 13 360 The pre-synaptic leptotene.
1912 Jrnl. Exper. Zool. 13 362 Are the leptotene-threads of this period chromosomes?
1912 Jrnl. Exper. Zool. 13 368 Figs. 73 a and 73 b show two early leptotene-nuclei of this species.
1925 E. B. Wilson Cell (ed. 3) vi. 541 In the case of animals..the leptotene-spireme is not continuous but consists of separate segments.
1964 G. H. Haggis et al. Introd. Molecular Biol. vii. 197 The chromosomes at leptotene must each consist of two chromatids so closely apposed as to give the appearance of a single structure.
1970 E. J. Ambrose & D. M. Easty Cell Biol. x. 325 The cell nuclei at this stage contain chromosomes in the form of very fine single threads, hence the name leptotene, meaning ‘slender ribbon’.
This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2022).
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n.1912