Vocab

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Vocab

• Cell Cycle Mitosis
• Cytokinesis Chromosome
• Chromatid Centromere
• Prophase Metaphase
• Anaphase Telophase

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Vocab Continued

• Growth factors Apoptosis
• Cancer Benign
• Malignant Metastasize
• Carcinogens Interphase
• Asexual Reproduction
• Binary Fission

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Questions from the book

• P. 76 1, 2, 3, 4, 5, 6
• P.79 1, 2, 3, 1, 2, 3
• P. 81 1, 2, 3, 1, 2
• P. 83 1, 2

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Mitosis Cell Division
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Mitosis

• The process of cells dividing (or replicating)
• Occurs in body cells (also called somatic cells)
  NOT in sex cells ovaries and testes)
• Allows cell size to remain small
• Focus is on DNA dividing

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• Chromatin DNA when NOT in Mitosis looks like
  spagetti
• Chromosome DNA DURING Mitosis thick and coiled
  into a rod shape

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DNA- duplicates during mitosis
centromere
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Major Concept!!!

• DNA MUST duplicate before the cell divides so
  that the two resulting cells (called daughter
  cells) will have the exact same DNA (identical)
  as the original cell (parent cell).

Multiple steps occur here
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Interphase Stage before AND after Mitosis (not
during)

• Phase where cell performs its normal activities
  for life.
• DNA is in the chromatin state (kind of like
  spaghetti)

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Centrioles appear
Parent cell is diploid (2n) has two complete
sets of chromosomes
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Centrioles move
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Prophase

• Prophase- the nuclear membrane breaks down. The
  double stranded chromosomes are able to move
  feely around the cytoplasm

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METAphase MIDDLE
Centrioles produce spindle fibers which attach to
centromeres
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ANAphase AWAY
(DNA)
Spindle fibers pull chromatids apart
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Cytoplasm starts to divide cleavage furrow forms
Nuclear membrane re-forms spindle fibers
disappear chromosomes uncoil
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CYTOKINESIS
Cytoplasmic division
Diploid (2n) two sets of chromosomes
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Mitosis
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How is mitosis different in plant cells?

• The only difference is during telophase. Instead
  of the cell membrane pinching in during
  cytokinesis, the cell wall forms a cell plate
  between the two daughter cells,

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plant cytokinesis
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Mitosis produces identical offspring (2N---2N)