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Notes: Cell Division

Notes: Cell Division . Objective: Know the 6 stages of the cell cycle. Read pgs. 129-136. Cell Cycle. Cell cycle - the regular sequence of growth and division of a cell. The cell cycle begins when the cell is formed and ends when the cell divides and forms new cells. Cell Cycle. Chromosomes.

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Notes: Cell Division

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  1. Notes: Cell Division Objective: Know the 6 stages of the cell cycle. Read pgs. 129-136.

  2. Cell Cycle • Cell cycle - the regular sequence of growth and division of a cell. The cell cycle begins when the cell is formed and ends when the cell divides and forms new cells.

  3. Cell Cycle

  4. Chromosomes • Chromosomes: The coiled structure of DNA that forms in the cell nucleus during cell division.

  5. Chromosomes • Chromosomes are made up of many genes joined together like beads on a string. Although you have only 23 pairs of chromosomes, your body cells contain more than 60,000 genes. Each of the genes controls a particular trait.

  6. What’s a Chromosome?

  7. Chromatids • Chromatids: One of the identical rods of a chromosome.

  8. Centromere • Centromere: The structure that holds the chromatids together.

  9. Asexual Reproduction • Asexual Reproduction: A single parent produces offspring that are genetically identical to the parent. Video

  10. Stages of the Cell Cycle • Interphase: Intelligent • Mitosis • Prophase: People • Metaphase: Meet • Anaphase: At • Telophase: Three O • Cytokinesis: Clock

  11. Interphase • 1. Interphase: Cell grows to maturity • Copies DNA • Cell prepares to reproduce Video

  12. Mitosis • Mitosis is the process in which a cell replicates it’s nucleus, stages 2-5. • Mitosis is a special stage in the cell cycle.

  13. Mitosis • 2. Prophase: Chromatin condenses to form chromosomes, spindle fibers form, and nuclear membrane breaks down. Video

  14. Mitosis • 3. Metaphase: Chromosomes line up at equator and attach to a spindle fiber at its centromere. Video

  15. Mitosis • 4. Anaphase: Spindle fibers shorten and chromatids separate and move to opposite ends of the cell. Video

  16. Mitosis • 5. Telophase: A new nuclear membrane forms around each new set of chromosomes. Video

  17. End of Mitosis • The nucleus has now been copied and the cell is waiting to divide into two identical cells.

  18. Cytokinesis • 6. Cytokinesis: Cell membrane pinches off and forms two identical daughter cells with the same number of chromosomes.

  19. Mitosis Videos • Mitosis • Bill Nye Mitosis

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