Helpful Links and Practice Materials:
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Assignments:
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Guiding questions:
1. What kind of selection has taken place over time? Diversifying, stabilizing, directional? How can you tell? 2. Why does the mosquito population evolve so quickly in response to DDT? What does this mean for human efforts to treat pests with poisons? 3. Did DDT cause the appearance of the R allele? If so, how? If not, then where did the allele come from? 4. Why does the R allele almost disappear after DDT use stops? 5. How does the fitness of the + and R alleles depend on the environment? |