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Chapter 10 Cell Growth

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10-2 Cell Division * Carry Genetic Information From One Generation of Cell to the Next Generation of Cells Made Up Of: DNA + Protein Every Organism Has A Specific ... – PowerPoint PPT presentation

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Title: Chapter 10 Cell Growth


1
Chapter 10 Cell Growth Division
  • 10-2 Cell Division

2
Chromosomes
  • Carry Genetic Information From One Generation of
    Cell to the Next Generation of Cells
  • Made Up Of
  • DNA Protein

3
Chromosomes
  • Every Organism Has A Specific Number Of
    Chromosomes
  • Fruit Flies 8
  • Carrots 18
  • Humans 46
  • Giraffe 30
  • King Crab 208

4
Chromosomes
  • Not Visible Except During Division
  • Well Before Division They Duplicate

5
Chromosomes
  • Chromatids
  • Just Before Division Chromosomes Condense Into
    Compact, Visible Structures Called Chromatids
  • Centromere
  • Each Chromosome Has Two, Identical Chromatids
    Connected By A Centromere

6
Chromosomes
Chromatid A
Copy of Chromatid A
Centromere
Kenitophore
Microtubules or Spindle Fibers
Copy of Chromatid A
Chromatid A
7
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8
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9
The Cell Cycle
  • Key Concept
  • During The Cell Cycle
  • A Cell Grows
  • Prepares For Division
  • Divides To Form Two Daughter Cells
  • Each Daughter Cell Then Begins The Cycle Again

10
Cell Cycle
11
Interphase
  • Time In-Between Cell Divisions

12
Cell Division or M phase
13
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14
Events Of The Cell Cycle
  • Interphase
  • May Be Quite Long
  • Divided Into 3 Parts

15
The 3 Parts of Interphase
  • G1 Phase
  • Cell Grows In Size
  • Synthesize New Proteins Organelles

16
The 3 Parts of Interphase
  • S Phase
  • Chromosomes Are Replicated
  • Once This Phase Begins The Cell Completes Division

17
The 3 Parts of Interphase
  • G2 Phase
  • Organelles Proteins Required For Mitosis Are
    Produced
  • Cell Is Now Ready To Enter
  • M Phase (Mitosis)

18
Mitosis
  • Key Concept
  • Biologists Divide The Events Of Mitosis Into Four
    Phases
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase

19
Prophase
  • 1st Longest
  • Phase
  • Chromosomes Become Visible
  • Centrioles Separate Take Up Position On
    Opposite Sides Of The Nucleus
  • Spindle Begins To Form

20
Prophase
  • In Animals
  • Spindle Fibers Attach To Centromere On Each
    Chromatid
  • In Plants
  • No Centromere, Spindle Fibers Still Form From
    Centrosomes

21
Late Prophase
  • Nucleolus Disappears
  • Nuclear Envelope Breaks Down

22
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23
Metaphase
  • Short
  • Just A Few Minutes
  • Chromosomes Line Up Across Center Of The Cell
  • Microtubules Connect The Centromere To The Poles
    Of The Spindle

24
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25
Anaphase
  • Centromeres Separate
  • Sister Chromatids Separate
  • Each Set Of Chromosomes Pulled To Their Poles

26
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27
Telophase
  • Chromosomes Disperse
  • New Nuclear Envelopes Form
  • Spindle Breaks Apart
  • Nucleolus Reforms

28
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29
Cytokinesis
  • There Are Now Two Nuclei In One Cell
  • Cytokinesis Is The Division Of The Cytoplasm Into
    Two Cells
  • The Cell Membrane Is Drawn Inward Until The Cell
    Pinches Into Two Equal Parts

30
Cytokinesis In Plants
  • A New Cell Plate Forms In The Middle Of The Cell
    Which Attaches To, And Becomes Part Of, The Cell
    Wall

31
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