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Cell Division: Understanding the Process of Cellular Growth and Division

Explore cell division - a crucial process for reproduction, growth, and repair. Understand the cell cycle, mitosis, and cytokinesis, and how DNA instructions guide these activities. Discover the stages of interphase, mitosis (prophase, metaphase, anaphase, telophase), and cytokinesis, leading to the formation of daughter cells.

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Cell Division: Understanding the Process of Cellular Growth and Division

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  1. http://www.youtube.com/watch?feature=player_detailpage&v=Q6ucKWIIFmghttp://www.youtube.com/watch?feature=player_detailpage&v=Q6ucKWIIFmg

  2. 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.

  3. 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?

  4. Interphase What happens • G1-the cell grows larger • SPhase: DNA replicates (makes copies) • These are called chromatids. Centrioles appear and hold them together • G2-Organelles double in number; the cell is checked for mistakes which are corrected

  5. Mitosis: PROPHASE What happens • DNA forms chromosomes • Spindle forms • Centrioles move toward opposite poles (a clue!) • Nuclear membrane begins to disappear Draw the final picture

  6. Mitosis: METAPHASE What happens • Nucleus has disappeared completely • Chromosomes line up in the middle(a clue!) of the cell Draw the final picture

  7. Mitosis: ANAPHASE What happens • Centromeres divide • Chromatids separate and move apart(a clue!) to opposite poles Draw the final picture

  8. Mitosis: TELOPHASE What happens • Nuclear membrane forms around each group of chromosomes to begin forming two (a clue!) cells • Chromosomes unwind • Cytokinesis begins Draw the final picture

  9. Cytokinesis What happens • Cytoplasm divides (a clue!) into two cells called daughter cells Draw the final picture

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