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CHAPTER 11
EVOLUTION OF POPULATIONS
SECTION 11.3: NATURAL SELECTION IS NOT THE ONLY MECHANISM BY WHICH POPULATIONS EVOLVE
PPT NOTES 3
1. Is natural selection the only mechanism through which populations evolve?
2. What are the other mechanisms of evolution?
3. Gene flow is the movement of __________________ between populations and occurs when
individuals move to join new ____________________ and reproduce.
4. If genes don’t flow between populations what could happen to the species in two nearby
populations?
5. What is genetic drift?
6. Does genetic drift increase or decrease genetic diversity?
7. Dos genetic drift tend to occur in large or small populations and WHY?
8. What are two ways a population can experience genetic drift
9. What happens to a population to cause a bottleneck effect?
CHAPTER 11
EVOLUTION OF POPULATIONS
SECTION 11.3: NATURAL SELECTION IS NOT THE ONLY MECHANISM BY WHICH POPULATIONS EVOLVE
PPT NOTES 3
10. What result does a bottleneck event have on genetic variation?
11. Define founder’s effect
12. What are the negative effects of genetic drift on a population?
13. ________________ ____________________ occurs when certain traits increase mating
success.
14. Do males or females face a higher cost for reproduction?
15. Why do females have a higher cost for reproductions?
16. What are the two types of sexual selection?
17. Define:
Intra-sexual selection-
Inter-sexual selection.
CHAPTER 11
EVOLUTION OF POPULATIONS
SECTION 11.3: NATURAL SELECTION IS NOT THE ONLY MECHANISM BY WHICH POPULATIONS EVOLVE
PPT NOTES 3