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Ch. 3-5

Ch. 3-5. Cell Division. Cell Division. Cells multiply by dividing Two types Mitosis – somatic cells Replace dead or injured cells Add new cells to tissue growth Meiosis – reproductive cells Makes gametes. Chromosomes. Before division, chromosomes duplicate Strands are called chromatids

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Ch. 3-5

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  1. Ch. 3-5 Cell Division

  2. Cell Division • Cells multiply by dividing • Two types • Mitosis – somatic cells • Replace dead or injured cells • Add new cells to tissue growth • Meiosis – reproductive cells • Makes gametes

  3. Chromosomes • Before division, chromosomes duplicate • Strands are called chromatids • Matching strands are called sister chromatids • Held together by a centromere

  4. Cell Cycle • Goal: create new daughter cells with the same number of chromosomes as the parent cell (mitosis) • Phases • I - P M A T

  5. Interphase • Between divisions • Cell growth • DNA replication • Make organelles and proteins

  6. Prophase • Chromatin becomes chromosomes • Nuclear membrane disappears • Spindle forms

  7. Metaphase • Chromosomes line up in the middle, or equator, of cell

  8. Anaphase • Sister chromatids are pulled to opposite poles

  9. Telophase • Nuclear membranes appear • Cytokinesis begins • Chromosomes uncoil to chromatin • Two new cells are formed

  10. Cytokinesis • When the cytoplasm divides and the two cells are distinctly their own

  11. Mitosis

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