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The Cell Cycle & Cell Division

The Cell Cycle & Cell Division. NOTES: 1. Write the purpose for each type of cell division. (mitosis & meiosis) 2. Draw, label and describe each phase of mitosis & meiosis. MITOSIS. Mitosis. two daughter cells from a single parent cell. Creates new cells for growth & repair

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The Cell Cycle & Cell Division

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  1. The Cell Cycle & Cell Division

  2. NOTES:1. Write the purpose for each type of cell division. (mitosis & meiosis)2. Draw, label and describe each phase of mitosis & meiosis.

  3. MITOSIS

  4. Mitosis • two daughter cells from a single parent cell. • Creates new cells for growth & repair • The daughter cells are identical to parent cell.

  5. Mitosis can be divided into stages • Interphase • Prophase • Metaphase • Anaphase • Telophase & Cytokinesis

  6. DNA replicated Organelles replicated Cell increases in size InterphaseThe cell prepares for division

  7. Interphase Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  8. Packages DNA into chromosomes ProphaseThe cell prepares for nuclear division

  9. Prophase Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  10. Chromosomes line up at the center of the cell Spindle fibers attach from daughter cells to chromosomes at the centromere MetaphaseThe cell prepares chromosomes for division

  11. Metaphase Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  12. Spindle fibers pull chromosomes apart ½ of each chromosome (called chromotid) moves to each daughter cell AnaphaseThe chromosomes divide

  13. Anaphase Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  14. TelophaseThe cytoplasm divides DNA spreads out 2 nuclei form Cell wall pinches in to form the 2 new daughter cells

  15. Telophase Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  16. MitosisAnimation http://www.cellsalive.com/mitosis.htm

  17. Mitosis -- Review

  18. MEIOSIS

  19. Meiosis • Creates new cells for reproduction • One parent cell produces four daughter cells. • Daughter cells have half the number of chromosomes found in the original parent cell

  20. Meiosis During meiosis, DNA replicates once, but the nucleus divides twice.

  21. Meiosis Four stages can be described for each division of the nucleus.

  22. Meiosis I First division of meiosis

  23. First Division of Meiosis • Prophase 1: Each chromosome duplicates and remains closely associated. These are called sister chromatids. • Metaphase 1: Chromosomes align at the center of the cell. • Anaphase 1: Chromosome pairs separate with sister chromatids remaining together. • Telophase 1: Two daughter cells are formed with each daughter containing only one chromosome of the chromosome pair.

  24. Prophase I http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

  25. Meiosis Second Division of Meiosis

  26. Second Division of Meiosis • Prophase 2: DNA does not replicate. • Metaphase 2: Chromosomes line up at the center of the cell • Anaphase 2: Centromeres divide and sister chromatids move separately to each pole. • Telophase 2: Cell division is complete. Four haploid daughter cells are formed.

  27. Prophase II http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

  28. Meiosis http://www.biosci.uga.edu/almanac/bio_103/notes/apr_3.html.

  29. Meiosis Animation http://www.rothamsted.bbsrc.ac.uk/notebook/courses/guide/movie/meiosis.htm

  30. Mitosis Asexual Cell divides once Two daughter cells Genetic information is identical Meiosis Sexual Cell divides twice Four haploid daughter cells Genetic information is different Differences in Mitosis & Meiosis

  31. Comparison Animations http://www.pbs.org/wgbh/nova/baby/divi_flash.html

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