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Meiosis

Meiosis. http://www.biology.arizona.edu/cell_bio/tutorials/meiosis/main.html. Interphase. Same as in mitosis Growth and Replication G1 – cell growth G2 – replication of chromosoms G3 – growth and preparation for cell division. Chromosomes. Karotype. Prophase I.

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Meiosis

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  1. Meiosis http://www.biology.arizona.edu/cell_bio/tutorials/meiosis/main.html

  2. Interphase • Same as in mitosis • Growth and Replication • G1 – cell growth • G2 – replication of chromosoms • G3 – growth and preparation for cell division

  3. Chromosomes

  4. Karotype

  5. Prophase I • Chromosomes thicken and condense ( become visible) • Centrioles move to the poles • Nuclear envelop disappears • Homologous chromosomes come together during SYNAPSIS to form a TETRAD • Crossing-over occurs

  6. Metaphase I • Chromosomes move to the equator as a tetrad • Spindle fibers attach to chromosome

  7. Anaphase I • Spindle fibers shorten • Homologous chromosomes separate and move to the poles

  8. Telophase I / Cytokinesis • Cell membrane begins to pinch in • Nuclear membrane reappears • The cytoplasm divides • Formation of cell membrane • Results in two haploid daughter cells

  9. Proceeds just as mitosis with the exception of chromosome replication. THEY DO NOT REPLICATE AGAIN!!! Prophase II Metaphase II Anaphase II Telophase II Cytokinesis Meiosis II

  10. ??????????????????????

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