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Cell Division

Cell Division. Why do cells divide?. Reproduction Growth Repair. How does the cell know how to divide?. The DNA has the instructions for all of the cell’s activities. Cell Cycle. The sequence of development and division of a cell. 3 Parts. Interphase - Preparation

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Cell Division

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  1. Cell Division Why do cells divide? • Reproduction • Growth • Repair How does the cell know how to divide? The DNA has the instructions for all of the cell’s activities.

  2. Cell Cycle The sequence of development and division of a cell 3 Parts • Interphase - Preparation • Mitosis – Cell division • Cytokinesis – Splitting • Adult human cell: ~24 hrs • 18-20 hours in interphase • 2 hours in mitosis • Embryonic cells: 30 min. How long does it take?

  3. Interphase What happens • Cell doubles in size • DNA replicates • Organelles double in number

  4. Mitosis: PROPHASE What happens • DNA forms chromosomes • Spindle forms • Centrioles move toward opposite poles • Nuclear membrane begins to disappear

  5. Mitosis: METAPHASE What happens • Nucleus has disappeared completely • Chromosomes line up in the middle of the cell “equator”

  6. Mitosis: ANAPHASE What happens • Centromeres divide • Chromatids separate and move to opposite poles

  7. Mitosis: TELOPHASE What happens • Nuclear membrane forms around each group of chromosomes • Chromosomes unwind • Cytokinesis begins

  8. Cytokinesis • Cytoplasm divides • One cell becomes 2 cells What happens

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