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1 st BILL of 2014

1 st BILL of 2014. Please answer these questions honestly. Be constructive in your response as it will be a tool for me going forward with the rest of the school year. Thank you. What do we do in class that you enjoy? What do we do in class that you would like to see changed?

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1 st BILL of 2014

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  1. 1st BILL of 2014 Please answer these questions honestly. Be constructive in your response as it will be a tool for me going forward with the rest of the school year. Thank you. • What do we do in class that you enjoy? • What do we do in class that you would like to see changed? • What can I do for you to make class more enjoyable? • What would you like to see more of in class?

  2. Cell Cycle and Mitosis IB Biology – January 3, 2012

  3. Cell Cycle • Cell cycle is the process cells use to grow and divide. • Cell cycle produces two new cells (in most cases). These cells are called daughter cells.

  4. Largest part of time (90%) in cell cycle is occupied by the INTERPHASE. This phase includes G0/G1, S, and G2 phases. Cells metabolic activity is very high during interphase. Interphase

  5. G0 – also known as stationary phase. Cells are known to be “quiescent” G1 – Major portion of cell growth occurs during this state. G stands for “Gap”. G0/G1

  6. Replication of DNA. Duplication/formation of chromosomes. “S” Stands for synthesis of DNA. Cells begin S phase with single copies of chromosomes and finish S phase with duplicate copies. S Phase

  7. Anatomy of a chromosome

  8. BILL – 1/6/14 • Watch the video “Cell Division and The Cell Cycle”. Name at least one importance of the mitosis and at least one negative aspect of cell division.

  9. Cell enters second growth phase. (Gap 2) Cell prepares to enter the “Mitotic” cycle. Chromatin begins to condense Cell completes preparations for cell division. G2 Phase

  10. MITOSIS After all preparations have been made by the cell, the final stage of the cell cycle is MITOSIS. Mitosis is subdivided into 4 main phases: *Prophase *Metaphase *Anaphase *Telophase/Cytokinesis

  11. Chromatin fibers become tightly coiled forming chromosomes Nuclear envelope (membrane) disappears. Mitotic spindle forms and completes by end of prophase. Centromere of each chromosome has a kinetochore region that attaches to spindle. Centrosomes begin to move toward opposite poles of cell. Prophase

  12. Prophase

  13. Chromosomes move to equator of cell. Centromeres line the equator. Chromosomes can move via microtubules Metaphase

  14. Metaphase

  15. Shortest phase of mitosis. Chromatids (chromosomes) now move towards opposite poles of the cell. Microtubules are getting “chewed up” and thus getting shorter. At the end of phase, each pole has a complete set of identical chromosomes (if everything goes correct) Anaphase

  16. Anaphase

  17. Chromosomes are now at each pole. Nuclear membrane begins to reform around each set of chromosomes. Spindle apparatus dissapears. Cell is elongated and ready for cytokinesis. Telophase

  18. Telophase

  19. Cytokinesis is the inward pinching of the fluid plasma membrane to form cleavage furrows. In other words, the cell actually divides. Cytokinesis

  20. Cytokinesis

  21. Summary

  22. Good Resource! http://www.biology.arizona.edu/Cell_bio/tutorials/cell_cycle/main.html

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