20 Simulation in Genetics Key p. 165

  1. MEET THE PARENTS!

    Questions

    1. In this simulation, how many genes does each parent have to control a trait?
      1

    2. In this simulation, how many genes can each parent contribute to a gamete?
      8

    3. For Gene #1 on dimples, what kind of color(s) and number of each would be found in
      Henrietta's bag? 50 blue (DD)
      Henry's bag? 50 red (dd)

    4. What tupe(s) of gametes could Henrietta make? D
      What tupe(s) of gametes could Henty make? d

    5. For Gene #2 on hand use, what kind of color(s) and number of each would be found in
      Henrietta's bag? 50 red (hh)
      Henry's bag? 25 blue 25 red (Hh)

    6. What type(s) of gametes could Henrietta make? h
      What tupe(s) of gametes could Henry make? H or h

    7. How is chance involved when Henrietta makes gametes for Gene #1 concerning dimples? No chance involved, 100% D
      How about Gene #2 concerning hand use? 50% right-handed (H), 50% left-handed (h).

  2. MEET THE CHILDREN! p. 167

    Questions p. 167

    1. Do your two children have identical genotypes for all eight traits?
      No

    2. Do your two children have identical phenotypes for all eight traits?
      No

    3. How was chance involved in the production of the children?
      Random fertilization of the gametes.

    4. Compare the other children at your table to yours for all genotypes and phenotypes. Did any of the children have identical genotypes? Phenotypes?
      Most likely not.

    5. Compare the sex ratio for the children produced by your table and also for the entire class. Record the ratios in Table 3 and Table 4, respectively. Was the ratio exactly that as you expected? Why or why not?
      Sex ratios should be fairly similar.

    6. Omit chi-square test.

    7. Compute the phenotypic ratios for Genes # 1-3 and record these ratios in Table 3. For each trait, provide the expected ratios based upon the genetic makeup of the parents.
      1. 1:0
      2. 1:1
      3. 3:1
      4. 3:1
      5. 1:1:1:1
      6. 1:1
      7. 3:1
      8. 1:1

    8. Omit chi-square test.

Lab notes made Oct 11, 2009 by Peter Chen