Cell Division

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Cell Division
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What is the functionof cell division?

• Unicellular organisms use cell division as a way
  to reproduce.
• Multicellular organisms use cell division in
  growth, development, repair, and reproduction.

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The nucleus contains genetic material.

• The genetic material is called DNA.
• DNA contains information for an organisms growth
  and functions.
• Long strands of DNA form chromosomes.
• Chromosomes are divided into sections called
  genes.

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Growth, Development, Repair, Reproduction

• Multicellular organisms are made of trillions of
  cells.
• Multicellular organisms began as single cells.
• Cell division is important to 4 major functions
  growth, development, repair, and reproduction

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Growth

• Growing is when an organism increases in size.
• Multicellular organisms do not grow because their
  cells increase in size. (Cells to do grow, but
  there is a limit to their size.)
• Multicellular organisms grow because cell
  division increases the number of cells in it.

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Growth
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Development

• Development occurs as cells specialize to perform
  particular functions.
• If cell division were the only process,
  multicellular organisms would end up as spheres
  of identical cells.
• Specialized cells may take on the shapes or
  structures that help them perform their
  functions.
• All cells in an organism have the same genetic
  material, they just use special parts of the
  code.

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Development
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Repair

• When as organism ages or is injured, the worn out
  or damaged cells need to be replaced by new cells
  formed when healthy cells divide.
• Refer to page 78 in your textbook.

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