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Cell Division

Cell Division

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Cell Division

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  1. Cell Division Cells & Heredity Chapter 2.3 Pages 61-68

  2. The Cell Cycle • The sequence of growth and division of cells is called the Cell Cycle. Consists of 3 main stages…

  3. Stage 1 - Interphase • Cell grows to maturity, completely forming its functional structures • Doubles in size • Copies its DNA in the nucleus via Replication • Cell prepares to divide.

  4. Stage 2 - Mitosis • A copy of DNA is distributed to each of 2 daughter cells • Four Phases • Prophase • Metaphase • Anaphase • Telophase

  5. Key Terms • Chromatin: Material in cells that contain DNA • Chromosome: doubled rod of condensed chromatin • Chromatid: identical strands held together by a centromere.

  6. 4. Telophase • Chromosomes stretch out • Nuclear membrane forms 1. Prophase • Chromatin condenses to chromosomes • Spindle fibers form bridge 2. Metaphase • Chromosomes align in center • Attach to spindle fibers • 3. Anaphase • Chromosomes split as spindles retract • Cell begins stretching

  7. Stage 3 - Cytokinesis • Cytoplasm separates organelles as it divides into two cells • The membrane pinches off • Plant cells can not pinch, instead form a cell plate.

  8. Round & Round • Duration of Cell Cycle varies on type of cell being created • Liver cells take 22 hours • Brain cells never divide.

  9. What to Work On • Read Section 2.3 in the textbook • Pages 61 to 68 • Answer the Section Review questions • Page 68 • Numbers 1 through 4.

  10. What to Work On • Complete the following Section Reviews • Page 44, #1-4 • Page 54, #1-4 • Page 59, #1-5