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The Cell Cycle

The Cell Cycle. Interphase & Mitosis. Intro. The cell cycle is the order of steps (cycle) a cell goes through in order to make new cells. The order of the stages of the cell cycle are: G1 (Gap 1) S (Synthesis) G2 (Gap 2) M (Mitosis) Cytokinesis. interphase. G1 phase ( Interphase ).

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The Cell Cycle

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  1. The Cell Cycle Interphase & Mitosis

  2. Intro • The cell cycle is the order of steps (cycle) a cell goes through in order to make new cells. • The order of the stages of the cell cycle are: • G1 (Gap 1) • S (Synthesis) • G2 (Gap 2) • M (Mitosis) • Cytokinesis interphase

  3. G1 phase (Interphase) • Growth and normal specialized roles • Normal cell growth; “lag phase” • Cell grows in size (doubles), collects nutrients needed for synthesis

  4. S phase (Interphase) • Genetic information inside of the cell doubles to create two sets of identical chromosomes.

  5. G2 phase (Interphase) • Cell produces cell parts which are needed during mitosis • Organelles are copied

  6. M (Mitosis) • Mitosis is the division of one mother cell into two identical daughter cells (asexual reproduction)

  7. Prophase • Spindle Fibers form • Centrioles move to opposite poles • Chromosomes become visible, nuclear membrane disappears

  8. Metaphase • Chromosomes line up along the equator of the cell. • METAPHASE=MIDDLE!

  9. Anaphase • Sister chromatids separate • Sister chromatids, now called daughter chromosomes, move to opposite poles

  10. Telophase • Nuclear membranes reform around each group of chromosomes • Chromosomes unwind • Cytokinesis begins, forming a cleavage furrow in animals and the cell wall begins to reform in fungal and plant cells.

  11. Cytokinesis • The process by which the cytoplasm divides and one cell becomes two individual cells. • Process is different for plant and animal cells • Animals - cell membrane pinches inward • Plants - a new cell wall forms between the two new cells

  12. Cell Cycle

  13. Cancer • Cancer occurs when cells no longer respond to cell cycle controls. • UNCONTROLLED DIVISION: Never enters G0!

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