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11/7/2011
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BIOLOGY 3 CH-8 REVIEW
WORKSHOP
ContentsContentsContentsContents
�Cell Cycle�Mitosis�Meiosis
Why do cells divide?Why do cells divide?Why do cells divide?Why do cells divide?
Cell growth, repair, and
replacement of lost or
damaged cells.
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Asexual Reproduction VS. Sexual ReproductionAsexual Reproduction VS. Sexual ReproductionAsexual Reproduction VS. Sexual ReproductionAsexual Reproduction VS. Sexual Reproduction
Figure A: Asexual Reproduction; bacteria undergoing binary fission (genetically identical)
Figure B: Sexual Reproduction; eukaryotic organism with offspring (not genetically identical)
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The Eukaryotic Cell Cycle and Mitosis
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The Eukaryotic Cell Cycle
The Eukaryotic Mitotic Phase
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Growth factors signal and cell cycle
control system
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Meiosis and Crossing Over
Diploid CellDiploid Cell
Haploid CellHaploid Cell
(Germ Cell)
(Sperm or Egg Cell)
Meiosis IMeiosis IMeiosis IMeiosis IInterphase
Prophase I
Metaphase I
Anaphase I
Meiosis IIMeiosis IIMeiosis IIMeiosis II
*Telophase I and
CytokinesisProphase II Metaphase II Anaphase II
Telophase II and
Cytokinesis
*still considered Meiosis I
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CROSSING OVER
CROSSING OVER (CONT.)
CROSSING OVER (CONT.)
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Sex chromosomes
Nondisjunction
Abnormal Numbers of Sex Chromosomes
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