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Mitosis

Mitosis. An animation of cell division By: Mrs. Miller. What is mitosis. Mitosis – The process of cell division, in which a cell is copied exactly. (it has the same number of chromosomes as the original cell). What do you think? 1. Watch Video.

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Mitosis

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  1. Mitosis An animation of cell division By: Mrs. Miller

  2. What is mitosis • Mitosis – The process of cell division, in which a cell is copied exactly. (it has the same number of chromosomes as the original cell) • What do you think? • 1. Watch Video. • 2. Watch Video and make observations (drawings and words). • 3. Watch Video to see if you missed anything.

  3. Supporting vocabulary • Cell cycle - The life cycle of a cell that begins when the cell is formed and ends when the cell divides and forms new cells. • DNA – Genetic material that carries information to make new cells. • Chromosomes – Structures that DNA is organized into. • Centromere – A region within a cell in which chromatids are held together.

  4. Animal Cell Reproduction (Mitosis) Plant Cell Reproduction (Mitosis)

  5. Reasons for Mitosis • Cells need to divide and duplicate for the following reasons: • 1. Growth – young organisms grow into adults throughout their life cycle • 2. Repair – new cells are needed to repair damage (ie. cuts, broken bones) • 3. Replacement – new cells need to replace old cells (ie. skin cells, lining of stomach and small intestine)

  6. How does it work? • Preparing to divide = Interphase • Mitosis Phases: • 1. Prophase • 2. Metaphase • 3. Anaphase • 4. Telophase • After division = Cytokinesis

  7. Interphase: Copying DNA Cell Nucleus Nucleolus Chromosomes Centrioles (animal cells only)

  8. Copying DNA: Interphase Cell Nucleus Nucleolus Chromosomes Centrioles Chromosomes are copied.

  9. Copying DNA: Interphase Cell Nucleus Nucleolus Chromosomes Centrioles Centrioles move to opposite poles (sides) of the nucleus.

  10. Mitosis Phase 1: Prophase Cell Nucleus Nucleolus Chromosomes Centrioles Nuclear membranes dissolve.

  11. Mitosis Phase 1: Prophase Cell Nucleus Nucleolus Chromosomes Centrioles Chromosomes condense into rodlike structures.

  12. Mitosis Phase 2: Metaphase Cell Nucleus Nucleolus Chromosomes Centrioles Nucleolus spreads out into string-like fibers.

  13. Mitosis Phase 2: Metaphase Cell Nucleus Nucleolus Chromosomes Centrioles Chromosomes line up along the equator.

  14. Mitosis Phase 3: Anaphase Cell Nucleus Nucleolus Chromosomes Centrioles Chromatids separate and move to opposite sides of the cell.

  15. Mitosis Phase 4: Telophase Cell Nucleus Nucleolus Chromosomes Centrioles Chromatids separate even farther.

  16. Mitosis Phase 4: Telophase Cell Nucleus Nucleolus Chromosomes Centrioles Nuclear membranes form around each set of chromosomes.

  17. Mitosis Phase 4: Telophase Cell Nucleus Nucleolus Chromosomes Centrioles Chromosomes unwind.

  18. Cytokinesis: the cells divide Cell Nucleus Nucleolus Chromosomes Centrioles Cytoplasm divides and is pinched off from the membrane.

  19. Assignment • Fold 6 pieces of white paper almost in half (leave room to title each at the bottom). • Glue the longer side of each piece to construction paper. • Write the phase on the longer portion. • Draw a picture of the phase on the front. • On the inside explain what happens in each phase. • Write to inform on the additional paper provided. This must be at least one paragraph that includes why mitosis happens and describe a cell cycle.

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