Indicate whether the statement is true or false. 1. Sources of genetic variation include mutation, recombination, and lateral gene transfer.
2. A gene pool includes all alleles within a certain population.
3. If a population is in Hardy-Weinberg, then it is not evolving.
4. Recessive and dominant allele frequencies do not have to add up to 100%.
5. Natural selection acts directily on genotypes.
6. Isolations can be due to geographic, behavioral, or sensation barriers.
Multiple Choice
Identify the choice that best completes the statement or answers the question.
7. What type of curve is formed with a normal distribution?
a. steep curve c. punctuated curve
b. bell curve d. flat curve
8. Natural selection acts directly on
a. alleles.
b. genes.
c. phenotypes.
d. mutations.
9. What situation might develop in a population having some plants whose flowers open at midday and other
plants whose flowers open late in the day?
a. behavioral isolation
b. geographic isolation
c. temporal isolation
d. genetic drift
10. Which of the following are assumptions that evolution is happening...
a. Very small population c. Selective mating
b. Mutations d. All of the above
11. What commonly occurs after the bottleneck and founder effects?
a. gene flow c. genetic variation
b. genetic drift
12. If an allele makes up one half of the frequency of a population’s allele for a given trait, its allele frequency is
a. 100 percent.
b. 75 percent.
c. 50 percent.
d. 4 percent.
13. In a fox population, the allele frequency of a gene for red fur changes from 20 percent to 30 percent. What can
you say about that population of foxes?
a. The population is expanding.
b. The population is evolving.
c. The population is decreasing.
d. The population is not evolving.