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Exploring Cell Cycle and Mitosis in 7th Grade Science

Discover the fascinating process of cell growth and division through mitosis. Learn about the cell cycle, interphase, prophase, metaphase, anaphase, telophase, and cytokinesis. Understand why cells reproduce by mitosis for growth, repair, and replacement. Engage with animated resources and photographs to enhance your understanding. Suitable for 7th-grade science students.

garymcintyre
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Exploring Cell Cycle and Mitosis in 7th Grade Science

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  1. Cell Cycle 7th Grade Science

  2. How do little elephants grow up to be BIG elephants?

  3. Why do animals shed their skin?

  4. Three reasons why cells reproduce exact copies of each other by mitosis are: 1. Growth 2. Repair 3. Replacement Cells that reproduce by mitosis reproduce constantly!

  5. Animated Mitosis Cycle http://www.cellsalive.com/mitosis.htm • Interphase • Prophase • Metaphase • Anaphase • Telophase & Cytokinesis

  6. “Cell growth and development” Interphase

  7. Interphase(occurs before Mitosis begins) • A cell grows in size, performs its function, and creates organelles needed to perform functions • Chromatin are copied (# doubles) called sister chromatin • A cell creates specific organelles for the purpose of dividing (Centrioles, Spindle Fibers) A cell spends most of its life in this phase! CELL MEMBRANE Nucleus Cytoplasm

  8. Interphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  9. “Division of the nucleus” Mitosis

  10. Prophase 1st step in Mitosis • Chromitin condenses to form chromatids and begin to attach to sister chromatids (clones from interphase) • Centrioles appear and begin to move to opposite ends of the cell and spindle fibers form between the centrioles. • Nuclear Envelopebegins to break down. Centrioles Sister chromatids Spindle fibers

  11. Prophase Plant Cell Animal Cell Spindle fibers Centrioles Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  12. Metaphase 2nd step in Mitosis • Chromatids attach and move to the equator (middle) of the cell • Sister Chromatids (or pairs of chromosomes) attach to the spindle fibers at the centromere Centromere Centrioles Spindle fibers

  13. Metaphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  14. Anaphase 3rdstep in Mitosis • Centromeressplit and sister chromatids(or pairs of chromosomes) separate • Sister chromatids begin to move to opposite ends of the cell • Opposite ends of the cell begin to push apart Centrioles Spindle fibers

  15. Anaphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  16. Telophase4th step in Mitosis • Nuclear envelope begins to form and two new nuclei form. • Chromosomes appear as chromatin (threads rather than rods). (Mitosis ends) Nuclei Nuclei Chromatin

  17. Telophase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  18. “Division of the cytoplasm” Cytokinesis

  19. Cytokinesisoccurs after mitosis • Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.

  20. Animal Mitosis -- Review

  21. Plant Mitosis -- Review

  22. MitosisAnimation http://www.cellsalive.com/mitosis.htm

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