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Cell Division: Mitosis

Cell Division: Mitosis. Section 8.2 Summary – pages 201 - 210. Cell theory All cells come from pre-existing cells Cells are the basic unit of organization of organisms. All living things are made of cells. Section 8.2 Summary – pages 201 - 210. Cell Division.

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Cell Division: Mitosis

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  1. Cell Division: Mitosis

  2. Section 8.2 Summary – pages 201 - 210 • Cell theory • All cells come from pre-existing cells • Cells are the basic unit of organization of organisms. • All living things are made of cells.

  3. Section 8.2 Summary – pages 201 - 210 Cell Division • The process when 2 cells are produced from one cell • Begins with one parent cell • Results in 2 daughter cells identical to the parent cell

  4. Section 8.2 Summary – pages 201 - 210 • Chromosomes--carriers of the genetic material that is copied and passed from generation to generation of cells.

  5. Section 8.2 Summary – pages 201 - 210 The structure of eukaryotic chromosomes Centromere Sister chromatids Supercoil within chromosome Chromosome Continued coiling within supercoil Histone H1 Nucleosome DNA

  6. Section 8.2 Summary – pages 201 - 210 • Cell cycle—sequence of growth and division of a cell, divided into 3 main periods • Interphase • Mitosis • Cytokinesis Mitosis Interphase Cytokinesis

  7. Section 8.2 Summary – pages 201 - 210 • Interphase—Cell grows in size, carries on metabolism, makes DNA, and prepares for division Interphase DNA synthesis and replication Centrioles replicate; cell prepares for division Rapid growth and metabolic activity

  8. Section 8.2 Summary – pages 201 - 210 • Mitosis—Process of cell division where 2 identical daughter cells are formed Mitosis is divided into 4 phases—prophase, metaphase, anaphase, telophase Mitosis

  9. Section 8.2 Summary – pages 201 - 210 Prophase: longest phase of mitosis • Chromatin--coils into visible chromosomes • Sister chromatids— doubled strands of DNA held together by a centromere Spindle fibers Disappearing nuclear envelope Doubled chromosome

  10. Section 8.2 Summary – pages 201 - 210 Prophase • Nuclear envelope— begins to disappear and nucleolus disintegrates • Centrioles—are in opposite ends of the cell • Spindle Fibers are formed Spindle fibers Disappearing nuclear envelope Doubled chromosome

  11. Section 8.2 Summary – pages 201 - 210 Sister Chromatids Centromere Sister chromatids

  12. Section 8.2 Summary – pages 201 - 210 Metaphase: shortest phase • Doubled chromosomes are lined up along the equator (middle) of the cell Centromere Sister chromatids

  13. Section 8.2 Summary – pages 201 - 210 Anaphase • Chromosomes are pulled apart at the centromere and separated

  14. Telophase Section 8.2 Summary – pages 201 - 210 • Chromatids are in different sides of the cell • Chromatids unwind • Nuclear envelope and nucleolus reappear • Cell membrane begins to split cell in 2 Nuclear envelope reappears Two daughter cells are formed

  15. Section 8.2 Summary – pages 201 - 210 • Cytokinesis— process where the cell’s cytoplasm divides between 2 new cells • In animal cells—2 cells are separated by membrane “pinching in” between them • In plant cells—2 cells are separated by a cell plate that forms in between them

  16. Mitosis Prophase Metaphase Anaphase Telophase

  17. Mitosis Prophase Metaphase Anaphase Telophase

  18. IPMAT • I Picked My Apples Today • Idiot, Pass Me Another Taco • I Propose All Men Are Toads

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