The Cell Cycle Chapter 2, Lesson 1. A big question for something so little! You start life as a...
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Transcript of The Cell Cycle Chapter 2, Lesson 1. A big question for something so little! You start life as a...
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The Cell CycleChapter 2, Lesson 1
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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?
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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
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Left SideDraw Figure 1 from page 88 in your notebook.
Use Color
Predict: What phase is the longest?
Interphase, Mitosis, or Cytokinesis. Explain.
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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.
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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
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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.
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Left Side: Write/Pair/Share Predicit: Do ALL cells go through
interphase?
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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.
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Mitosis Four main phases
Prophase Metaphase Anaphase Telephase
More about this later . . .
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Different cells at different times