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 ...
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.
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.
[edit] Leptotene
The first stage of prophase I is the leptotene stage, also known as leptonema, from Greek words meaning "thin threads."[1] During this stage, individual chromosomes begin to condense into long strands within the nucleus.
Prophase I — a detailed view
The lengthy and complex events of prophase I can be broken down into 5 stages.
1. Leptotene ...
Five different stages can be differentiated: leptotene, zygotene, pachytene, diplotene and diakinesis. Prophase is followed by metaphase I, anaphase I, telophase I and interkinesis.
 See also: Meiosis, Chromosome, Prophase, Cells, Diplotene
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