Cameron Behrendt Miosis

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Cameron Behrendt Miosis

  1. 1. Miosis By, Cameron Behrendt
  2. 2. Interphase • Centriole pairs also replicate. • Similar to mitosis Interphase • Each Duplicated chromosome Consist of two identical sister chromatids attached at their centromeres • Nucleus and nucleolus are visible. ● Chromosomes Replicate (S Phase)
  3. 3. Interphase (Continued)
  4. 4. Prophase I • Longest and most complex phase (90%). • Chromosomes Condense ● Synapsis Occurs: Homologous chromosomes come together to form a tetrad.• Tetrad is two chromosomes or four chromatids (sister and nonsister chromatids)
  5. 5. Prophase I - Synapsis Homologous Chromosomes
  6. 6. Metaphase I • Shortest Phase • Tetrads align on the metaphase plate. • INDEPENDENT ASSORTMENT OCCURS: 1. Orientation of homologous pair to poles is random. 2. Variation 3. Formula: 2n Example: 2n=4 Then n=2 Thus 2²=4 Combinations
  7. 7. Metaphase I
  8. 8. Anaphase I • Homologous chromosomes seoerate and move towards the poles • Sister chromatids remain attached at the centromeres.
  9. 9. Anaphase I
  10. 10. Telophase I • Each pole now has haploid set of chromosomes • Cytokinesis occurs and two haploid daughter cells are formed.
  11. 11. Telophase I
  12. 12. Prophase II Same as prophase in mitosis
  13. 13. Metaphase II Same as metaphase in mitosis
  14. 14. Anaphase II • Same as anaphase in mitosis • Sister chromatids seperate
  15. 15. Telophase II • Same as telophase in mitosis • Nuclei form • Cytokinesis occurs • Remember: Four haploid daughter cells produced Gametes = Sperm or egg
  16. 16. Telophase II
  17. 17. Cytokinesis
  18. 18. Centrioles
  19. 19. Centromere
  20. 20. Homologous Chromosomes
  21. 21. Spindle Fibers
  22. 22. Sister Chromatids
  23. 23. Nuclear Membrane
  24. 24. Cell Membrane

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