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Gamete Production

Gamete Production. Centrosomes. Nucleus. 1 ST MEIOTIC INTERPHASE. DNA. DNA Replicates (“S” stage). Chromatin forms. MEIOSIS I. GERM CELL. DNA condenses into chromosomes. PROPHASE I. Homologous chromosomes pair up to form a tetrad. Spindle fibers form. Crossing over may occur.

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Gamete Production

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  1. Gamete Production

  2. Centrosomes Nucleus 1ST MEIOTIC INTERPHASE DNA DNA Replicates (“S” stage) Chromatin forms

  3. MEIOSIS I

  4. GERM CELL DNA condenses into chromosomes PROPHASE I Homologous chromosomes pair up to form a tetrad. Spindle fibers form Crossing over may occur Centrosomes move apart Nuclear envelope breaks down

  5. METAPHASE I Tetrads align in middle of cell Spindle fibers attach to centromeres

  6. Crossing over creates recombinant chromosomes Homologs separate and move apart “Free” spindle fibers lengthen; cell elongates ANAPHASE I

  7. TELOPHASE I Chromosomes reach centrosomes

  8. CYTOKINESIS I Nuclear membrane reforms Cell divides into two daughter cells

  9. 2ND MEIOTIC INTERPHASE CYTOKINESIS I

  10. MEIOSIS II

  11. PROPHASE II

  12. METAPHASE II

  13. ANAPHASE II

  14. TELOPHASE II

  15. CYTOKINESIS II

  16. FOUR UNIQUE GAMETES

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