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The Cell Cycle

Discover the intriguing life cycle of cells, from single-cell beginnings to trillion-cell complexity. Uncover the phases of the cell cycle - Interphase, Mitosis, Cytokinesis - and explore how different cells have varying cycle lengths. Learn about the critical stages of Interphase and the cell's readiness for reproduction. Gain insights into Mitosis and its four main phases: Prophase, Metaphase, Anaphase, Telephase. Explore the uniqueness of cells at different times and the importance of understanding cellular reproduction.

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The Cell Cycle

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  1. The Cell Cycle Chapter 2, Lesson 1

  2. A big question for something so little! • You start life as a single cell!! • You will have a trillion cells!! SO . . . • How are all these cells made? • How long does a cell live?

  3. The Cell cycle • Cell cycle = the life cycle of a cell • Just like all living things, our CELLS have a cycle of life. • Phases of cell cycle • Interphase Birth/Childhood • Mitosis Teenager • Cytokinesis Leaving your parents

  4. Left Side Draw Figure 1 from page 88 in your notebook. Use Color Predict: What phase is the longest? Interphase, Mitosis, or Cytokinesis. Explain.

  5. Length of Cell Cycle • Different for different cells • Skin = 24 hours • Brain = never finishes, stays in Interphase. • Zebra Fish: • From 1 cell to hatching in 48 hours. • Sea Urchin • From 1 cell to 4 in 2 hours.

  6. First is Interphase • When a cell is getting ready to reproduce. • The longest phase. • The chromosomes in the nucleus look like a bunch of thin spagehetti because they are getting ready to be copied. • Interphase has 3 phases = G1, S, G2

  7. The Phases of Interphase • G1 – Growth and regular cell functions. • S – Growth and the chromosomes make copies of themselves and the NUCLEUS makes copy. • G2 – Growth and cell functions. All the organelles make copies of themselves.

  8. Left Side: Write/Pair/Share • Predicit: Do ALL cells go through interphase?

  9. Left Side – Answers • Muscles, nerve, brain and red blood cells do NOT reproduce. Injuries to these can be permenant. The cells don’t leave interphase. • Drugs literally kill brain cells. . . You can’t get them back.

  10. Mitosis • Four main phases • Prophase • Metaphase • Anaphase • Telephase • More about this later . . .

  11. Different cells at different times

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