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Cell Reproduction

Explore the process of cell reproduction through the phases of the cell cycle - Interphase, Mitosis, and Cytokinesis, and understand the importance of cell cycle for growth, repair, and replacement of cells. Discover how cells multiply and divide to create identical daughter cells.

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Cell Reproduction

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  1. Cell Reproduction http://player.discoveryeducation.com/index.cfm?guidAssetId=9B385B50-541B-447A-89CF-2016A3CFC094&blnFromSearch=1&productcode=US

  2. Cell Cycle • Goal: one cell creates two new • identical cells • Interphase – period of rapid growth • – all materials are doubling • 2. Mitosis - nucleus of cell divides [4 stages] • Prophase • Metaphase • Anaphase • Telophase • 3. Cytokinesis - cytoplasm divides

  3. Why is cell cycle needed??? • Growth – allows organism to • reach maturity • 2. Replace worn out cells- every cell dies at some • point • 3. Repair damaged cells – allows damaged areas of • organisms to be fixed • Cells that do not go through cell cycle: Muscle & Nerve

  4. Parent Cell Chromosome Nuclear membrane Cell membrane

  5. [Increasing] Interphase Cell membrane * Cell Membrane, nuclear membrane, cytoplasm, and all organelles double * DNA doubles * DNA long, thin threads = chromatin *Cell needs to double all materials in order to be able make two new cells Nuclear membrane Chromatin

  6. [Preparing] Prophase Centrioles *DNA shortens and coils- chromosomes appear *Centromeres appear [hold chromosomes together] *Spindle fibers appear *Centrioles appear [poles found in animal cells, will guide chromosome movement] * Nuclear membrane begins to disappear Centromere Nuclear membrane Chromosome Spindle fibers

  7. [Middle] Metaphase *Chromosomes line up in center of cell and attach to spindle fibers * Spindle fibers attach to centrioles Centriole Centromere Chromosome Spindle fiber

  8. [Apart] Anaphase Chromosome *Centrioles tug on spindle fibers pulling chromosomes apart * Centromeres are lost Centriole Spindle fiber

  9. [Two new] Telophase *Two new nuclear membranes appear creating two new identical nuclei *Spindle fibers and centrioles disappear Chromosome Nuclear membrane

  10. Cytokinesis [cytoplasm divides] Cell membrane Cell Plate Chromosomes Nuclear membrane * Cytokinesis = cytoplasm divides How? * Animals- cell membrane pinches * Plants- Cell plate grows from center inward of cell outward

  11. Daughter Cells Nuclear membrane * Two new cells identical to parent cell and each other * Each cell contains same number of chromosomes as parent cell Chromosome

  12. Cell Cycle Interphase = 80% All Materials Double DNA duplicates and cell grows Nucleus Doubles Cell Growth Cytokinesis Cytoplasm Divides

  13. Interphase • Prophase • Metaphase • Anaphase • Telophase • Cytokinesis • Daughter Cells I IPayedMoney AtThe Car Dealership

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