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Mitosis meiosis powerpoint.ppsx

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Transcript

  • 1. Words to think about in this unit.
    Mitosis
    Meiosis
    Chromosomes
    Chromatids
    Homologous chromosomes
    Cell cycle
    Cancer
    Haploid vs. diploid
    Somatic cells versus germ line cells
  • 2. Mitosis and Meiosis
    Sea star morula
  • 3.
  • 4. Sea Urchin Development
  • 5. In prokaryotes, cell division is simple= Binary Fission forms 2 daughter cells
    Single circular DNA molecules
  • 6. Binary Fission
  • 7. Different story for Eukaryotes… WHY?
    Bigger
    More DNA many linear chromosomes
    Packaged differently than prokaryotes
    Chromosome= long DNA molecule packaged with proteins (called ____________)into compact shape.
  • 8. OVERVIEW
    Chromosomes composed of CHROMATIN= Protein and DNA
    1 human chrom= 140 million nucleotides
    1 chromosome stretched out = 2 inches
  • 9. Mitosis and Meiosis
    Mitosis: cell ÷ in somatic cells
    Meiosis: cell ÷ in germ cells
  • 10. Cell cycle- cell division and the events that prepare a eukaryotic cell for division
  • 11. Chromosome
    When chromosomes replicate, form IDENTICAL sister chromatids.
    Centromere-connects 2 sister chromatids
  • 12. Homologous
    • Chromosomes (replicated or not) exist in homologous pairs-
    • 13. Each member of pair carries SIMILAR info!
    • 14. Cells with homologous chromosomes= diploid cells
  • Human karyotype
  • 15. Diploid(2n) versus haploid(n)
  • 16. QUIZ
  • 17. QUIZ
    In the cell cycle, what does “S” stand for?
    What is the definition of somatic cell?
    What does this picture represent?
  • 18. Mitosis
  • 19. Mitosis
  • 20.
  • 21. Meiosis
  • 22. Meiosis
  • 23. Mitosis versus meiosis
  • 24. Independent Assortment
  • 25. Crossing over
  • 26. Nondisjunction in meiosis I
  • 27. Nondisjunction in meiosis II
  • 28. Fertilization after nondisjunction