Leptotene stage

The leptotene stage, also known as the leptonema, is the first of five substages of prophase I in meiosis. The term leptonema derives from Greek words meaning "thin threads".^[1]:27 A cell destined to become a gamete enters the leptotene stage after its chromosomes are duplicated during interphase. During the leptotene stage those duplicated chromosomes—each consisting of two sister chromatids—condense from diffuse chromatin into long, thin strands that are more visible within the cell plasme. The next stage of prophase I in meiosis is the zygotene stage.^{[1]:27[2]:353}

During this stage, the chromosomes attach themselves by telomeres to the inner membrane of the nuclear envelope. Lateral (axial) elements of the synaptonemal complex are also formed.

References

1. Snustad, DP; Simmons, MJ (December 2008). Principles of Genetics (5th ed.). Wiley. ISBN 978-0-470-38825-9.
2. Krebs, JE; Goldstein, ES; Kilpatrick, ST (November 2009). Lewin's Genes X (10th ed.). Jones & Barlett Learning. ISBN 978-0-7637-6632-0.