Case of the dividing cell

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Case of the dividing cell

  1. 1. The Case of the Dividing Cell By Lauren and Robert
  2. 2. Life Cycle of a Cell - Mitosis  Interphase  Prophase  Metaphase  Anaphase  Telophase  Cytokinesis
  3. 3. Interphase  Longest stage  3 stages: G1, S, G2  G1 – cell accelerates biochemical processes that were slowed down by mitosis  S – DNA replication  G2 – chromosomes condense
  4. 4. Prophase  Spindle fiber is formed  Centrioles are duplicated  Nuclear envelope begins to break up
  5. 5. Metaphase  Chromosomes line up in center of cell
  6. 6. Anaphase  Chromosomes split  Move to opposite sides of the cell
  7. 7. Telophase  Chromosomes are completely separate  Nuclear envelope begins to reform
  8. 8. Cytokenesis  Cells split apart  Two daughter cells result
  9. 9. Cell Division – Prokaryotes vs. Eukaryotes  Prokaryotes use binary fission  DNA replicates; strands attach to membrane  Cell elongates; DNA separates  Cell wall and membrane grow from the center of cell causing division  Eukaryotes must go through all the steps of either mitosis or meiosis
  10. 10. Meiosis  1st half (Meiosis 1) is the same as mitosis  2nd round skips the DNA replication  4 haploid daughter cells result
  11. 11. Mitosis vs. Meiosis  Mitosis  Asexual reproduction  2 diploid cells result  Meiosis  Sexual reproduction  4 haploid cells result
  12. 12. Crossing Over  Exchange of genetic material between homologous chromosomes  Occurs during Prophase 1 of Meiosis  However, similarities in sequences can cause non-homologous chromosomes to cross over with each other.
  13. 13. Why is Meiosis Important for Sexual Reproduction?  Sexual reproduction uses two haploid cells  They combine to produce a diploid offspring  If the cells didn't divide a second time to make a haploid, the offspring would have double the diploid

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