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leptotenes
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Definitions of leptotenes in various dictionaries:
noun - the first stage of the prophase of meiosis
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The first stage of the prophase of meiosis, during which each chromosome becomes visible as two fine threads (chromatids). |
Leptotenes might refer to |
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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". 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 nucleoplasm. The next stage of prophase I in meiosis is the zygotene stage.During this stage, the chromosomes attach themselves by their ends (telomeres) to the inner membrane of the nuclear envelope.7 At the transition to the zygotene stage the telomeres usually aggregate at a nuclear envelope sector, thereby forming a meiotic bouquet. Lateral (axial) elements of the synaptonemal complex are also formed. It is the first stage of Prophase 1 in Meiosis 1. |