Cell Division

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Cell Division

• Mitosis vs. Meiosis
• .the battle continues

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Mitosis

• Type Asexual reproduction
• Growth, maintenance, and repair

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Cell Cycle

• Interphase
• Cells are in interphase
• 90 of the time.
• G1- growth
• S - chromosome replication
• G2- Prepare for mitosis
• Mitosis (nuclear division)
• Cytokinesis (cytoplasmic division)
  

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Overview of Mitosis
Mama Cell2n (diploid)
Daughter cell 2n (diploid)
Daughter cell 2n (diploid)
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Interphase (pre game show)

• Chromosomes are copied ( doubles)
• Chromosomes appear as threadlike coils
  (chromatin) at the start, but each chromosome and
  its copy(sister chromosome) change to sister
  chromatids at end of this phase

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PROPHASE
CENTRIOLES APPEAR AND MOVE TO OPPOSITE ENDS OF
THE CELL Spindle fibers form between centrioles

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METAPHASE

• Chromosomes meet in the middle. Spindle fibers
  attach to the centromere of each chromosome.

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ANAPHASE

• Sister chromatids separate from each other and
  are pulled to opposite ends of the cell.

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Telophase

• Cell plate forms and cell membrane begins
  pinching in cleavage.
• Chromosomes look like threads (chromatin) again.
  Nuclear envelope forms again.

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Cytokinesis

• Division of the cytoplasm
• Cell membrane completely pinches off.
• Cycle starts again.

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Rounds of Cell Division

• One

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Number of daughter cells

• Two, each identical to each other and the parent.

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TICKET OUT

• Discuss 2 new things that you learned today or
  found interesting
• Discuss 1 thing that you did not understand

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Meiosis

• Sexual reproduction
• Produce gametes
• Gametes are haploid
• Gametes rejoin during fertilization

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Meiosis I

• Crossing over

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Meiosis II

• Tetrad

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Chromosome number in Meiosis

• Mother cell-2n (Diploid)
• Daughter cells- n (Haploid)

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Round of cell division

• Two
• Illustrate mother cell with four chromosomes (2n)
  and daughter cells with two chromosomes (n) in
  each. Make sure to include replication before
  meiosis I.

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Number of daughter cells

• Four

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Lets compare!

• http//www.teachersdomain.org/resources/tdc02/sci/
  life/gen/mitosis/index.html