1 / 26

Mitosis

Mitosis. Ch. 9.1-9.3. Objectives. Describe how cell reproduction contributes to repair and growth Structure of a chromosome Explain cell cycle Understand mitosis and cytokinesis Basics of cancer. Two Functions of Cells. Repair Growth

kamin
Télécharger la présentation

Mitosis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Mitosis Ch. 9.1-9.3

  2. Objectives • Describe how cell reproduction contributes to repair and growth • Structure of a chromosome • Explain cell cycle • Understand mitosis and cytokinesis • Basics of cancer

  3. Two Functions of Cells • Repair • Growth • The outer layer of skin on your arm consists of dead cell. • Constantly replacing each other! • Cells also key in reproduction . . . more on that later

  4. An idea of where we’re at

  5. The DNA • Genetic material located in nucleus of cell • Most of the time it exists as chromatin • Chromatin: • Uncoiled DNA, not visible

  6. ChromosomesHome of the DNA • Cell prepares to divide • Chromatin fibers condense and become… • Chromosomes: • Condensed, visible threads of genetic material • Yarn example • Humans have 46 chromosomes

  7. ChromosomesHome of the DNA • Right before division, the cell duplicates all of it’s chromosomes • Sister Chromatids: • Identical, joined copies of chromosomes • Centromere: • Joining region of chromatids

  8. Check Your Neighbor • Quiz your neighbor on the terms we just learned.

  9. The Cell Cycle Let's Look at 3 examples of cell division (9.1 activity)

  10. The Cell Cycle • All cells divide at different rates • Interphase: • 90% of cycle • Three stages during interphase: • G1 • Synthesis • G2 • Miotic Stage (10%)

  11. Cell CycleStages of Interphase • G1: • Cell grows • Synthesis: • DNA duplicates • G2: • Cell prepares to divide • Cell Cycle Animation and Different Types of Cells That Divide (9.2)

  12. Cell Cycle Video Clip

  13. Check Your Neighbor • Quiz your neighbor on the cell cycle….

  14. Mitosis • Mitosis: • Non-sexual means of cellular reproduction • Four Stages: • Prophase • Metaphase • Anaphase • Telophase • Cytokinesis • Let’s use pipe cleaners to demonstrate the stages of mitosis. Draw them out after you make them.

  15. MitosisProphase • Nuclear envelope dissolves • Spindle forms • Chromosomes visible

  16. MitosisMetaphase • Chromosomes line up along equator • Spindles attach

  17. MitosisAnaphase • Chromatids separate • Pulled towards opposite ends of cell by spindles

  18. MitosisTelophase • Chromatids uncoil • Nuclear envelope re-forms

  19. Cytokenesis • Division of cytoplasm • Two identical daughter cells • Mitosis: Let's watch the real thing!

  20. Hand Jive Metaphase Prophase Anaphase Telophase

  21. Mitosis Quiz • When I pause the movie, you tell me what stage of Mitosis we are in.

  22. Cancer • Family or friends with cancer? • Cancer: • Uncontrollable cell division • Faulty checkpoints • Out of control cell reproduction produces tumors • Benign tumor: • Abnormal mass of normal cells • Malignant tumor: • Mass of cancer cells • Metastasis: • Spreading of cancer cells Activity 9.4 More cancer animation

  23. How a tumor is formed

  24. Proto-oncogenes encourage cell division

More Related