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The Cell Cycle:

The Cell Cycle:. Interphase and Mitosis McGraw Hill 3-D animation: http://www.mhhe.com/biosci/bio_animations/06_MH_CellCycle_Web/index.html https://www.youtube.com/watch?v=IHSs7HQs3d4. Purpose of the Cell Cycle. The cell cycle is needed for growth, development, tissue repair etc.

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The Cell Cycle:

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  1. The Cell Cycle: Interphase and Mitosis McGraw Hill 3-D animation: http://www.mhhe.com/biosci/bio_animations/06_MH_CellCycle_Web/index.html https://www.youtube.com/watch?v=IHSs7HQs3d4

  2. Purpose of the Cell Cycle The cell cycle is needed for growth, development, tissue repair etc. http://www.hhmi.org/biointeractive/human-embryonic-development Embryo developing from zygote animation

  3. The CELL CYCLE (Sequence of growth and division of a cell) • Interphase (cell grows, lives, undergoes metabolism etc.) • G1 stage = cell growth and development, • S stage= chromatin replicated in nucleus (S= DNA SYNTHESIS) • G2 stage= Getting ready for MITOSIS • centrioles (found only in animals) replicate • making of proteins needed for MITOSIS • F:\OneDrive\Desktop\animations from bio powerpoints\Chapter 08 BDOL IC

  4. Mitosis (process by which two daughter cells are formed, each with a complete set of chromosomes) • PMAT (stages of mitosis)

  5. https://www.dnalc.org/resources/3d/07-how-dna-is-packaged-basic.html DNA Condensation Animation • Prophase • chromosomes become visible • sister chromatids attached by Centromere • Nuclear envelope and nucleolus disintegrate • centrioles move to opposite poles of cell • The spindle apparatus forms

  6. Metaphase • Chromosomes line up down middle (equator) of cell.

  7. Anaphase • Centromeres split and sister chromatids separate and are pulled toward opposite poles of cell.

  8. Telophase • Chromatids reach opposite poles of cell • chromosomes unwind • spindle breaks down • nucleolus reappears • nuclear envelope reforms

  9. Cytokinesis = division of the cytoplasm • Animals: plasma membrane pinches in along equator • Plants: Cell Plate forms. • C:\Documents and Settings\BBAUGHMAN\Desktop\bio powerpoints\Chapter 08 BDOL IC

  10. Differentiation • Study the diagram and discuss. • How does this occur?

  11. Differentiation • Cells specialize by turning on (expressing)some genes but turning off others.

  12. 8.3 Control of the Cell Cycle • Normal Control of Cell Cycle • Enzymes control the cell cycle • Production of enzymes is controlled by genes (segments of DNA that control protein production) • Cancer: Mistake in the Cell Cycle!! • Mutations of genes that control the cell cycle • Uncontrolled cell growth • Tumors • Metastasis= spreading of cancer to other body parts. • 2nd leading cause of death in U.S. • Causes of cancer • Environmental factors (mutagens) • certain viruses • diet and exercise

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