BIOLOGY 3 CH-8 REVIEW

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ContentsContentsContentsContents

�Cell Cycle�Mitosis�Mitosis�Meiosis

Why do cells divide?Why do cells divide?Why do cells divide?Why do cells divide?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.

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

The Eukaryotic Cell Cycle

The Eukaryotic Mitotic Phase

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Growth factors signal and cell cycle

control system

Meiosis and Crossing Over

Diploid CellDiploid Cell(Germ Cell)

Haploid CellHaploid Cell(Sperm or Egg Cell)

Meiosis IMeiosis IMeiosis IMeiosis IInterphase

Metaphase I

Prophase 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

CROSSING OVER

CROSSING OVER (CONT.)

CROSSING OVER (CONT.)

Sex chromosomes

Nondisjunction

Abnormal Numbers of Sex Chromosomes