Biology 111: Lecture 12Fall 1998

Cell division

  1. Exact copies (asexual reproduction)
    1. Somatic cells
    2. Cell cycle
    3. Division
    4. Result
    5. Importance
    6. When things go wrong: Uncontrolled, excessive cell division (cancer)
      1. Benign tumors
      2. Malignant tumors
        1. Metastasis
        2. Types
        3. Treatment options

  2. "Half" copies (sexual reproduction)
    1. Germ cells
    2. Life cycle
      1. Homologous chromosomes vs. sister chromatids
      2. Haploid vs. diploid
    3. Division
      1. Two divisions
      2. Important events leading to genetic variation
        1. Crossing-over
        2. Segregation
        3. Independent assortment
    4. Result
    5. Importance
    6. When things go wrong: Nondisjunction
      1. Gametes with extra chromosomes
      2. Gametes with missing chromosomes

  3. Chromosomes and sex determination
    1. Autosomal chromosomes vs sex chromosomes
    2. Systems


"Life is lived forwards but understood backwards." C. S. Lewis