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The Cell Cycle

The Cell Cycle. Chapter 2, Lesson 1. 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?. The Cell cycle. Cell cycle = the life cycle of a cell

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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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