The first stage of prophase I of meiosis I in which the replicated chromosomes start to condense into long strands inside the nucleus. The chromosomes at this stage are characteristically threadlike in form.


During the first prophase of meiosis I, there are five sub-stages: leptotene, zygotene, pachytene, diplotene and diakinesis.

Word origin: from Greek meaning "thin threads"

Synonym: leptonema

See also: prophase I, meiosis I

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