Cell Growth and Division

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Cell Growth and Division

• Chapter 10

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Why do cells divide?

• Cells divide to allow the organism to grow and to
  repair damaged tissue
• Cells grow, then divide. Why dont they keep
  growing?
• Large cells do not have enough DNA to function.
• Large cells could not diffuse oxygen and
  nutrients efficiently. Agar block lab

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Cell division in Prokaryotes and Eukaryotes

• Prokaryotes single chromosome is copied and the
  cell splits.
• Eukaryotes All chromosomes must be copied into
  sister chromatids, held together by a centromere.
  The copies are then split apart in a process
  called MITOSIS. The cytoplasm is then split by
  CYTOKINESIS.

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The Cell Cycle

• Cell cycle

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Main steps of mitosis IPMAT

• Interphase The cells grows and replicates DNA
  and centrioles.
• Prophase DNA wraps up into chromosomes. The
  nuclear membrane dissolves.
• Metaphase Chromosomes line up. Spindle fibers
  created by the centrioles attach to the
  centromere..
• Anaphase The will spindle fibers will pull the
  sister chromatids apart
• Telophase chromosomes at opposite ends, the
  nuclear membrane re-forms.

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Live video of mitosis

• Cell division
• Newt cell division

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Extra Credit Opportunity

• Create cell models showing all 5 stages of
  mitosis (IPMAT).
• Cells must have (where applicable) and labeled
• At least 2 chromosomes
• Spindle fibers
• Centrioles
• Centromeres
• Nuclear membrane