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The Cell Cycle

The Cell Cycle. Where do cells come from?. The Cell Theory. All living things are made of cells Cells are the basic organizational unit of life. Cells must come from other cells. Simple cell division. Fun facts…. The human body must make an average of 610 billion blood cells per day.

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The Cell Cycle

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  1. The Cell Cycle

  2. Where do cells come from?

  3. The Cell Theory • All living things are made of cells • Cells are the basic organizational unit of life. • Cells must come from other cells.

  4. Simple cell division

  5. Fun facts… • The human body must make an average of 610 billion blood cells per day. • 200,000,000,000 red cells per day • 10,000,000,000 white cells per day • 400,000,000,000 platelets per day • The human body is made of about 100 trillion cells.

  6. The Cell Cycle • The cell has a life cycle called the cell cycle.

  7. The Cell Cycle • The cell cycle can simply be divided into 2 parts • Interphase • Mitosis

  8. The Cell Cycle Interphase Mitosis

  9. Interphase • Cells spend the majority of their time in interphase. • DNA is copied during this time

  10. Interphase

  11. Copying the DNA Chromatids Centromere holds the copied chromosome together Chromatin is un-wound DNA Chromosome that has not been copied. Copied Chromosome

  12. Mitosis • Mitosis is when the nucleus of a cell divides into 2 new nuclei

  13. So, what are the steps to mitosis? • Prophase • Metaphase • Anaphase • Telophase • Easy way to remember: P-MAT

  14. Prophase • Chromatids are visible in nucleus. • Nuclear membrane dissolves • Spindle fibers stretch towards the nucleus Chromatids Centromere holds the copied chromosome together Copied Chromosome Chromosome that has not been copied.

  15. Metaphase • Chromatid pairs line up along the center of the cell.

  16. Anaphase • Chromosomes separate.

  17. Telophase • Cytoplasm separates • New nuclei form in each cell

  18. When does Mitosis happen? • When a cell needs to be replaced: • When an organism is growing • After an injury where cells are lost • To maintain a living organism (once it is adult size)

  19. Why does Mitosis happen? • Because there needs to be a way to make more cells

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