Mitosis

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Mitosis

• Dillon Hall
• Zachary Bliek
• LaChanda Mills

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Mitosis

• -process of cell division which results in the
  production of two daughter cells from a single
  parent

-Five phases a. Prophase b.
Prometaphase c. Metaphase d. Anaphase e.
Telophase
Interphase
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Interphase

• Interphase is when the cell isnt in mitosis but
  it takes most of the time
• The cell may appear inactive during this stage
  but the cell is very active.
• This is the longest period due to the DNA
  replication
• the centrioles divide
• proteins are produced

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Phase One Prophase

• The 1st phase in mitosis
• Chromosomes are already duplicated
• The chromatin condenses and chromosomes are
  visible
• Nuclear envelope and nucleolus break apart
• Spindle fibers start to form
• Centrosomes move to opposite sides of the cell
• Aster Serve to brace the centrioles

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Phase Two Prometaphase

• Sister chromatids are ready to break apart
• Kinetochores Disk shaped structure in the
  centromere where spindle microtubules attach
• Kinetochoores extend from the poles of the
  chromosomes
• Chromosomes move towards poles one at a time
  until they are lined up

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Phase Three Metaphase

• Centromeres of the chromosomes are aligned in the
  center of the cell
• Metaphase Plate A perpendicular imaginary plane
  that passes through the center of the cell that
  indicates where future cell division will occur
• Polar spindle fibers are present and overlap the
  metaphase plate

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Phase Four Anaphase

• Sister chromatids break and give rise to two
  daughter chromosomes
• Daughter chromosomes have a centromere and a
  chromatid with a single double helix
• Move toward opposite poles
• Poles move apart because spindle fibers are
  moving past each other
• Microtubule-associated proteins cause it to move
• Shortest phase of mitosis

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Phase Six Telophase

• Spindle disappears
• New nuclear envelope forms in both daughter cells
• Each daughter cell has an exact copy of all the
  chromosomes from the parent cell
• Polar spindle fibers are visible between the
  nuclei
• The chromosomes become diffused into chromatin
• Nucleolus appears in each daughter cell

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Cytokinesis Animal Cells

• Division of cytoplasm
• Cleavage furrow (identification of membrane
  between two daughter nuclei) begins as anaphase
  ends
• In anaphase the cell starts to divide the
  organelles (duplicated in interphase) between the
  two daughter cells
• Cleavage furrow deepens when the contractile ring
  (band of actin filaments) form circular
  constriction between the two daughter cells
• Contractile ring (like a drawstring) contracts
  the center of the cell
• Two daughter cells split

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Cytokinesis Plant Cells

• Cleavage furrow does not occur because there is a
  cell wall
• A small flat disk appears between the daughter
  cells
• Golgi apparatus produces vesicles that move along
  the microtubules to a region of the disk
• Cell plate is formed
• Vesicles make up the new cell wall
• Cell wall is strengthened by cellulose fibrils

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Works Cited
http//student.ccbcmd.edu/courses/bio141/lecguide/
unit6/genetics/DNA/DNArep/fg26.html
http//www.cellsalive.com/mitosis.htm
http//128.121.138.33/VRML/mitosisb5.html
Biology 9th edition