Meiosis Stages

Meiosis I

Prophase I: Homologous chromosomes condense, pair up, and swap segments. Spindle microtubules attach to them as the nuclear envelope breaks up.

Metaphase I: Homologous chromosome pairs are aligned between spindle poles. Spindle microtubules attach the two chromosomes of each pair to opposite spindle poles.

Anaphase I: All of the homologous chromosomes separate and begin heading toward the spindle poles.

Telophase I: A complete set of chromosome clusters at both ends of the cell. A nuclear envelope forms around each set, so two haploid nuclei form.

Meiosis II

Prophase II: The chromosomes condense. Spindle microtubules attach to each sister chromatid as the nuclear envelope breaks up.

Metaphase II: The chromosomes are aligned midway between spindle poles.

Anaphase II: Sister chromatids separate. The now unduplicated chromosomes head to the spindle poles.

Telophase II: A complete set of chromosomes clusters at both ends of the cell. A new nuclear envelope forms around each set, so four haploid nuclei form.

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