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Prometaphase One

Prometaphase I is a stage of meiosis I that involves the breakdown of the nuclear envelope and the formation of a spindle fiber apparatus

Nuclear envelope breakdown: The nuclear envelope breaks down into membrane vesicles, exposing the nucleus to the cytoplasm

Spindle fiber apparatus: Microtubules grow from centrosomes at opposite ends of the cell and attach to the kinetochores of the chromosomes

Kinetochore formation: Protein structures called kinetochores form around the centromeres of the chromosomes

Homologous chromosome attachment: Microtubules attach to one homologous chromosome of each tetrad, with one homologous chromosome facing each pole

Recombination: Recombination between homologous chromosomes occurs

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