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Leptotene


leptotene
the early stage of prophase in meiosis I; the chromatids are not visible yet as separate structures
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
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Leptotene
[Gr. leptos - slender; Gr. tainia - ribbon]. The earliest stage in prophase 1 of of meiosis, when the thread-like chromosomes begin to condense and become visible.
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Leptotene
The term proposed by von Winiwarter (1900), originally as an adjective, to describe the nuclei at the earliest stage of prophase 1 of meiosis, when the chromosomes first become visible as fine threads and have not yet associated in pairs.
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Leptotene: chromosomes condense, the axial element of the synaptonemal complex (a protein lattice that keeps homologous chromosomes toghether) is formed.
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Leptotene
All the chromosomes condense.
Pairing. Homologous dyads (pairs of sister chromatids) find each other and align themselves from end to end with the aid of an axial element (that contain cohesins).
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In the leptotene stage, the cell's genetic material, which is normally in a loosely arranged pile known as chromatin, condenses into visible threadlike structures. Along the thread, centromeres are visible as small beads of tightly coiled chromatin.
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