12 Jun Experiment 1 – Genetic Variation
Question
Experiment 1: Genetic Variation
After completing Experiment 1 answer the following questions
1. What is the gene pool of beaker #1?
2. What is the gene pool of beaker #2?
3. What is the gene frequency of beaker #1?
4. What is the gene frequency of beaker #2?
5. What can you say about the genetic variation between these populations?
Experiment 2: Genetic Drift
After completing experiment 2, answer the following:
1. What observations can you make regarding the gene pool and gene frequency of the surviving individuals?
2. Do the results vary between the populations represented by beakers #1, #2 and #3? Why or why not?
3. What observations can you make about the genetic variation between the parent and surviving populations?
Experiment 3: Stochastic Events
After completing Experiment 3 answer the following:
1. What observations can you make regarding the gene pool and gene frequency of the founding individuals?
2. Do these results vary between the populations founded by beakers #1, #2 and #3? Why or why not?
3. What observations can you make about the genetic variation between the parent and founding populations?
4. Suppose you have a population of 300 butterflies. If the population experiences a net growth of 12% in the following year, how many butterflies do you have?
5. Now suppose you have 300 eggs, but only 70% of those eggs progress to become a caterpillar, and only 80% of the caterpillar progress to become adult butterfly. How many butterflies do you have? (For simplicity, assume that all butterflies survive to the next year, in this example)
6. Suppose you have a population of 150 butterflies, but a wildfire devastates the population and only 24 butterflies survive. What percent does the colony decrease by?
SKIP EXPERIMENT 4
Experiment 5: Sickle Cell Anemia Inheritance Patterns
After completing Experiment 5, answer the following:
1. What is the remaining ratio of alleles?
2. Have any been selected against?
3. Given enough generations, would you expect one of these alleles to completely disappear from the population?
Why or why not?
4. Would this be different if you started with a larger population? Smaller?
5. After hundreds or even thousands of generations both alleles are still common in those of African ancestry.
How would you explain this?
6. The worldwide distribution of sickle gene matches very closely to the worldwide distribution of malaria (Figure 7). What is the significance of this?
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