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Transcript

  • 1. Housekeeping
    • Quiz in lab NEXT WEEK
      • 10 points on Lab #1 and #2
      • No notes allowed
    • Homework due Monday at beginning of class
      • 2a-albino mouse:Aabbcc, black mouse: homozygous at all alleles
      • If handed in AFTER class, will be considered late
  • 2. Gametes Somatic Cells + 23 46 46 Mitosis Meiosis Sexual reproduction 23
  • 3. How do we create gametes? How do we maintain somatic cells?
  • 4. Growth phase Arrested Growth phase Figure 3.7
  • 5. What are the steps of mitosis? What is the relevance of each step?
  • 6. “ Mitosis Madness” By the students of St. Olaf College in Barb May’s Bio233 Genetics course Spring, 2003
  • 7. Group 1: Mitosis reenactment Group 2: Mitosis analyzers Group 3: Meiosis reenactment Group 4: Meiosis analyzers If Group 1 or 3 needs more people, steal from 2 and 4 respectively
  • 8. Analyzers job:
    • YOU BECOME THE EXPERTS OF MITOSIS/MEIOSIS
    • GOAL: Verify that the group highlights the important aspects of mitosis/meiosis
    • Design questions to ask after reenactment
      • Test knowledge of mitosis/meiosis
      • Make sure important steps of mitosis/meiosis are met (you will be tested on this!)
  • 9. What you have:
    • Construction paper
      • Designate your homologous chromosomes
      • Designate your sister chromatids
    • Streamers
      • Microtubules
    • Balls
      • Centromeres
    • Tape and scissors
    What you need:
    • 2 sets of homologous chromosomes (How many total chromosomes in the cell?)
    • Centromeres
    • Microtubules
    • Narrator(s)
  • 10. Another (not as exciting) interpretation of Mitosis
  • 11. Cell wants everything to go smoothly: Figure 3.11
  • 12. How do we create gametes? How do we maintain somatic cells?
  • 13. Gametes Somatic Cells + 23 46 46 Mitosis Meiosis Sexual reproduction 23
  • 14. Key terms:
    • Germ cells:
      • Located in reproductive organs
      • infinite lifespan
      • produce gametes
  • 15. Meiosis Mitosis 2 daughter cells (DIPLOID) 4 gamete cells (HAPLOID) What are the steps of meiosis? How is it different from mitosis?
  • 16. What are the steps of meiosis? Interphase Meiosis I Meiosis II
    • Prophase I
    • Metaphase I
    • Anaphase I
    • Telophase I
    • Cytokinesis
    • Prophase II
    • Metaphase II
    • Anaphase II
    • Telophase II
    • Cytokinesis
    • Leptotene
    • Zygotene
    • Pachytene
    • Diplotene
    • Diakinesis
  • 17. “ Meiosis Madness” By the students of St. Olaf College in Barb May’s Bio233 Genetics course Spring, 2003
  • 18. Meiosis Mitosis 2 daughter cells (DIPLOID) 4 gamete cells (HAPLOID) What are the steps of meiosis? How is it different from mitosis? At what stage are the cells haploid??
  • 19. Discussion assignment: Down syndrome occurs when an infant is born with three copies of chromosome 21 instead of the normal 2. Explain what error/how this error occurs in meiosis to allow for trisomy of chromosome 21.

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