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Ch 9 The Cellular Basis of Life

Ch 9 The Cellular Basis of Life. 9.1 Cells come from Cells Cells are needed for Mitosis : repair, growth, asexual reproduction (clones of one parent) Meiosis : sexual reproduction (two parents) Video clip (3 minute overview of mitosis/cancer). 9.2 The cell cycle multiplies cells.

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Ch 9 The Cellular Basis of Life

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  1. Ch 9 The Cellular Basis of Life • 9.1 Cells come from Cells Cells are needed for Mitosis: repair, growth, asexual reproduction (clones of one parent) Meiosis: sexual reproduction (two parents) Video clip (3 minute overview of mitosis/cancer)

  2. 9.2 The cell cycle multiplies cells Different number of chromosomes for each organism (humans have 46) Interphase: Chromosomes duplicate before the cell divides

  3. Mitosis- nucleus divided • and Cytokinesis-cell divides

  4. 9.3 Mitosis • Prophase=pairs • Metaphase=middle • Anaphase=away • Telophase=two • Cytokinesis animals Cell plate plants Onion root tip

  5. 9.4 Cancer • Cancer is due to uncontrolled cell cycle • Benign –local tumor • Malignant- travels around body by metastasis • Treatment=surgery, radiation, chemotherapy (some disrupt mitotic spindle)

  6. 9.5 Meiosis is used in sexual reproduction • Meiosis only occurs in sperm and egg so the new offspring doesn’t have double the chromosome number • Diploid • Haploid • Chick embryo • Pig embryo • Human embryo

  7. Meiosis- two divisions • Results in four • cells

  8. 9.6 Meiosis increases genetic variation

  9. Crossing over • In Meiosis

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