Definition

Noun: * Leptotene: The first stage of the prophase of meiosis, during which chromosomes become visible as long, thin, single threads and begin to condense.

Usage

• Leptotene is a highly specific biological term used exclusively in cell biology and genetics to describe the initial phase of meiotic cell division.
• It is an uncountable noun. You typically refer to "the leptotene stage" or say that a cell is "in leptotene."

Examples

• During leptotene, the chromosomes start to condense and become individually distinguishable under a microscope.
• The transition from interphase to leptotene marks the beginning of the complex process of prophase I in meiosis.
• Researchers observed the cells as they entered the leptotene stage of meiosis.

Advanced Usage

• The term is often used in technical descriptions of the meiotic process: "Synapsis has not yet begun in leptotene; it initiates in the subsequent zygotene stage."

Variants and Related Words

• Leptotene stage: A more descriptive phrase for the same phase.
• Prophase I: The larger phase of meiosis that includes leptotene, zygotene, pachytene, diplotene, and diakinesis.
• Zygotene: The stage immediately following leptotene, where homologous chromosomes begin to pair (synapsis).

Synonyms

• There are no direct common-language synonyms. In technical contexts, it can be referred to as:
  • The first prophase I stage
  • The initial condensation stage of meiosis

Different Meanings

• Leptotene has only one meaning, which is the specific biological stage described above. It is not used in general English.

Noun

1. the first stage of the prophase of meiosis