Florida International University

PCB 3063

Worksheet 10

19.3 Adaptive Evolution

1)Natural selection only acts on the population’s what?

2. What is adaptive evolution?
3. At what level does natural selection work and how?
4. What is fitness?
5. Why is relative fitness used instead of absolute fitness?
6. What are the ways selection can affect population variation?
7. What is stabilizing selection and how does this impact a population’s genetic variance?
8. What is directional selection and how does this impact a population’s genetic variance?
9. How was this demonstrated with the peppered moth?
10. What is diversifying selection and how does this impact a population’s genetic variance?
11. What is frequency-dependent selection and what is the outcome of negative or positive frequency-dependent selection?
12. What is sexual selection?
13. What is sexual dimorphism?