Practice Quiz for General Genetics
Chapter 23 -- Population and Evolutionary Process
Processes that Change Allelic Frequencies

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1. A change in allele frequency within a population due to chance is called
A. fixation
B. drift
C. wander
D. wobble

2. The lack of genetic diversity seen in populations of American bison is probably due to
A. migration
B. mutation
C. selection
D. a population bottleneck

3. The overall effect of migration between two populations is to
A. not change the similarity between the populations
B. increase the similarity between the populations
C. increase the inbreeding within the populations
D. decrease the similarity between the populations

4. A male prairie-chicken that is dominant on the lek and thus obtains more copulations with visiting females is an example of
A. stabilizing selection
B. fecundity selection
C. sexual selection
D. zygotic selection

5. Given that 100 individuals of the most fit genotype produce 1000 offspring, then the relative fitness of a genotype for which 100 individuals produce 150 offspring is
A. 0.85
B. 1.00
C. 0.30
D. 0.15

6. During directional selection in which one allele is selected against, we would expect that
A. VA decreases
B. (p + q) decreases
C. wbar decreases
D. (1 + w) decreases

7. In a balanced polymorphism (such as sickle cell trait in West Africa), you would have selection against
A. one homozygote and the heterozygote
B. the heterozygotes
C. one of the homozygotes
D. both homozygotes

8. We have a population of fence lizards (Sceloporus) that have been living on an island off the coast of North Carolina and unable to cross to the mainland for many thousands of years. The frequency of allele "a" at locus A in this population was 0.50. The frequency of allele "a" in the mainland population is 0.30. A few years ago humans built a bridge to this island and occasionally a lizard scurries across to the island from the mainland and mates. Today the frequency of "a" in the island population is 0.45. What has been the total extent of migration (m) since the bridge was built.
A. 0.25
B. 0.30
C. 0.05
D. 0.20

9. The Biological Species Concept is attributable to
A. McClintock
B. Mayr
C. Mendel
D. Fisher

10. Consider a locus with alleles "A" and "a" at which "A" mutates to "a" at the rate of 6x10-5 and "a" mutates to "A" at the rate of 7x10-6. What is the equilibrium value of q?
A. 0.104
B. 0.896
C. 0.117
D. 0.883

Last updated on 17 November 2004.
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