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Cell Reproduction

Cell Reproduction. Mitosis & Meiosis. http://biotech-adventure.okstate.edu/low/basics/mitosis/mitosis-diagram/diagram.gif. Cell Cycle. http://www.bmb.psu.edu/courses/biotc489/notes/cycle.jpg. Sexual Reproduction. Meiosis. Sexual Reproduction.

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Cell Reproduction

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  1. Cell Reproduction Mitosis & Meiosis

  2. http://biotech-adventure.okstate.edu/low/basics/mitosis/mitosis-diagram/diagram.gifhttp://biotech-adventure.okstate.edu/low/basics/mitosis/mitosis-diagram/diagram.gif

  3. Cell Cycle http://www.bmb.psu.edu/courses/biotc489/notes/cycle.jpg

  4. Sexual Reproduction Meiosis

  5. Sexual Reproduction A type of reproduction in which two sex cells, usually an egg and a sperm, join to form a zygote, which will develop into a new organism with a unique identity.

  6. Sexual reproduction results in a great variety, or diversity, of offspring.

  7. Meiosis • The nucleus divides twice • Meiosis I • Meiosis II

  8. http://biotech-adventure.okstate.edu/low/basics/meiosis/diagram/http://biotech-adventure.okstate.edu/low/basics/meiosis/diagram/

  9. Interphase • DNA is duplicated

  10. Prophase I • DNA shorten & thicken • Forms chromatids / chromosomes

  11. http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/prophase/leptotene/leptotene.gifhttp://biotech-adventure.okstate.edu/low/basics/meiosis/phases/prophase/leptotene/leptotene.gif

  12. Metaphase I • Copied chromatids / chromosomes line up in middle of cell • Centromeres attach to spindle fibers

  13. http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/metaphase-I/metaphase-I.gifhttp://biotech-adventure.okstate.edu/low/basics/meiosis/phases/metaphase-I/metaphase-I.gif

  14. Anaphase I • Chromatid pairs are pulled apart • They DO NOT separate • Move to ends of cell

  15. http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/anaphase-I/anaphase-i.gifhttp://biotech-adventure.okstate.edu/low/basics/meiosis/phases/anaphase-I/anaphase-i.gif

  16. Telophase I • Cell divides • No further replication of hereditary material

  17. http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/telophase-I/telophase-I.gifhttp://biotech-adventure.okstate.edu/low/basics/meiosis/phases/telophase-I/telophase-I.gif

  18. There are now two cells. Both cells have full sets of genetic material (chromosomes)

  19. Prophase II • Similar to mitosis • Starts with TWO cells instead of one • Spindle fibers appear

  20. http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/prophase-II/prophase-II.gifhttp://biotech-adventure.okstate.edu/low/basics/meiosis/phases/prophase-II/prophase-II.gif

  21. Metaphase II • Duplicated chromatid / chromosomes line up in middle of cell • Spindle fibers attach to centromeres

  22. http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/metaphase-II/metaphase-II.gifhttp://biotech-adventure.okstate.edu/low/basics/meiosis/phases/metaphase-II/metaphase-II.gif

  23. Anaphase II • Centromere divides • Chromatids separate & move to ends of cell • Chromatids are now individual chromosomes

  24. http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/anaphase-II/anaphase-II.gifhttp://biotech-adventure.okstate.edu/low/basics/meiosis/phases/anaphase-II/anaphase-II.gif

  25. Telophase II • Spindle fibers disappear • Nuclear membranes form at each end of cell • Cells divide • Results in 4 cells • Each with ½ the original number of chromosomes

  26. http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/telophase-II/telophase-II.gifhttp://biotech-adventure.okstate.edu/low/basics/meiosis/phases/telophase-II/telophase-II.gif

  27. Meiosis Animation http://www.johnkyrk.com/meiosis.html

  28. In summary:Meiosis • Two cells form during meiosis I • In meiosis II, both of these cells form two cells • The two divisions of the nucleus result in four sex cells (gametes) • Each has one-half the number of chromosomes in its nucleus that was in the original nucleus

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