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Name _____________________________________ Date ____/ ____/____ Period ____
Test Review, Chapter 11; The Evolution of Populations
1. Would a population with a lot of genetic variation or little genetic variation (circle one) be more
likely to have individuals that can adapt to a changing environment? Explain.
2. What is natural selection?
3. What are two major sources of genetic variation?
4. Draw a curve using the graph which indicates a certain trait in a population is not under any
selective pressure. What would a curve of such a population look like?
5. Over many generations, certain insect species have become
more and more resistant to insecticides. What type of
natural selection is this an example of, and how does it
differ from the other types?
Example: _____________________________
Describe: ________________________________________________________
6. Describe how gene flow can increase genetic variation within two neighboring populations.
7. How are the effects of genetic drift similar to the effects of having a small sample size in a
scientific experiment?
8. What are the two types of genetic drift? Describe each one.
a. _______________________________________________________
b. _______________________________________________________
9. Give an example of how sexual selection can cause extreme phenotypes in a population.
10. In a population which is undergoing evolution, allele frequencies change due to chance alone.
This is an example of ________________ ______________.
11. What are the five conditions necessary for a population to stay in Hardy-Weinberg
a. _______________________________________________________
b. _______________________________________________________
c. _______________________________________________________
d. _______________________________________________________
e. _______________________________________________________
12. Populations that meet these above five conditions are ___________ evolving.
13. What are the five factors that can lead to evolution?
a. ______________________________________________________
b. ______________________________________________________
c. ______________________________________________________
d. ______________________________________________________
e. ______________________________________________________
14. Describe three types of barriers that can cause populations to become reproductively isolated
from each other.
a. ______________________________________________
b. ______________________________________________
c. ______________________________________________
15. Explain why mutation and genetic drift are random events, while natural selection is NOT.
Mutation: _______________________________________________________________
Genetic Drift: _____________________________________________________________
16. Speciation is the rise of two or more species from one existing species. What process keeps the
number of total species on Earth from growing exponentially through speciation?
17. How can reproductive isolation lead to speciation?
18. What is the difference between coevolution and convergent evolution?
19. How does coevolution shape two species over time?
20. What is the relationship between speciation and the theory of punctuated equilibrium?
21. When a species is unable to adapt to a change in its environment then that species may become
22. Using the three graphs below, graph and describe the three ways natural selection can change
the distribution of traits.
23. Which distribution would represent a population whereby an extreme phenotype or trait is selected
24. What type of distribution occurs when all phenotypes provide an equal chance of survival?