Notes: Cell Division

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Notes Cell Division

• Objective Know the 6 stages of the cell cycle.
• Read pgs. 129-136.

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Cell Cycle

• Cell cycle - the regular sequence of growth and
  division of a cell. The cell cycle begins when
  the cell is formed and ends when the cell divides
  and forms new cells.

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Cell Cycle
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Chromosomes

• Chromosomes The coiled structure of DNA that
  forms in the cell nucleus during cell division.

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Chromosomes

• Chromosomes are made up of many genes joined
  together like beads on a string. Although you
  have only 23 pairs of chromosomes, your body
  cells contain more than 60,000 genes. Each of the
  genes controls a particular trait.

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Whats a Chromosome?
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Chromatids

• Chromatids One of the identical rods of a
  chromosome.

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Centromere

• Centromere The structure that holds the
  chromatids together.

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Asexual Reproduction

• Asexual Reproduction A single parent produces
  offspring that are genetically identical to the
  parent.

Video
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Stages of the Cell Cycle

• Interphase Intelligent
• Mitosis
• Prophase People
• Metaphase Meet
• Anaphase At
• Telophase Three O
• Cytokinesis Clock

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Interphase

• 1. Interphase Cell grows to maturity
• Copies DNA
• Cell prepares to reproduce

Video
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Mitosis

• Mitosis is the process in which a cell replicates
  its nucleus, stages 2-5.
• Mitosis is a special stage in the cell cycle.

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Mitosis

• 2. Prophase Chromatin condenses to form
  chromosomes, spindle fibers form, and nuclear
  membrane breaks down.

Video
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Mitosis

• 3. Metaphase Chromosomes line up at equator and
  attach to a spindle fiber at its centromere.

Video
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Mitosis

• 4. Anaphase Spindle fibers shorten and
  chromatids separate and move to opposite ends of
  the cell.

Video
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Mitosis

• 5. Telophase A new nuclear membrane forms around
  each new set of chromosomes.

Video
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End of Mitosis

• The nucleus has now been copied and the cell is
  waiting to divide into two identical cells.

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Cytokinesis

• 6. Cytokinesis Cell membrane pinches off and
  forms two identical daughter cells with the same
  number of chromosomes.

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Mitosis Videos

• Mitosis
• Bill Nye Mitosis