Mitosis and Meiosis

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Mitosis and Meiosis
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The Cell Cycle

• DNA contains the information that tells a cell
  how to make proteins.
• Chromosomes coiled structure of DNA and protein
  that forms in the cell nucleus during cell
  division.

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Prokaryotic Cells

• Binary Fission the simple cell division in which
  one cell splits into two used by bacteria.

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• Homologous chromosomes chromosomes with matching
  information.
• Chromotids identical copies of a chromosome.
• Centromere The region that holds chromotids
  together when a chromosome is duplicated.

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MITOSIS

• Nuclear division in a eukaryotic cell in which
  each cell receives a copy of the original
  chromosomes.

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Remember.

• There are 3 STAGES in this process
• Interphase
• Mitosis
• Cytokinesis

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Four phases of Mitosis

• Prophase
• Metaphase
• Anaphase
• Telophase

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Interphase

• The time in between cell division

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Interphase

• THE CELL GROWS TO ITS MATURE SIZE
• THE CELL MAKES A COPY OF ITS DNA
  CHROMATIN-(threadlike form of dna)
• IT PREPARES TO DIVIDE

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Prophase(phase 1)

• Nuclear membrane breaks apart
• Chromosomes become rodlike.
• Centrioles move to opposite sides of cell.
• Fibers form between two pairs of centrioles

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Metaphase(phase 2)

• Chromosomes line up along equator (middle) of the
  cell.
• Spindle fibers attach through the centromere

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Anaphase(phase 3)

• Chromotids separate and are pulled to opposite
  side of cell by the fibers attached to centrioles

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Telophase(phase 4)

• Nuclear membrane forms around two sets of
  chromosomes.
• Fibers disappear

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Cytokinesis

• Cytoplasm splits in two.
• Result two identical cell

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