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Name: ______________________________Class: _________________ Date: _________________
Genetic Variation Within Populations
Section 11.1 Quiz
Choose the letter of the best answer.
_____ 1. A measure of how commonly a particular allele occurs in a population
is known as the
a. gene pool.
b. allele frequency.
c. mutation rate.
d. phenotype.
_____ 2. The more genetic variation a population has, the more likely it is that
some individuals will
a. evolve.
b. migrate.
c. survive.
d. mutate.
_____ 3. Genetic variation can arise from a random change in the DNA of a
gene. This change is called a(n)
a. mutation.
b. gene flow.
c. gene pool.
d. allele.
_____ 4. The normal shuffling of alleles during meiosis results in
a. mutations.
b. hybridization.
c. reproduction.
d. recombination.
_____ 5. Which term means the crossing of two different species that share
common genes?
a. mutation
b. hybridization
c. population
d. recombination
Copyright © McDougal Littell/Houghton Mifflin Company.
Biology
1
The Evolution of Populations
Name: ______________________________Class: _________________ Date: _________________
Natural Selection in Populations
Section 11.2 Quiz
Choose the letter of the best answer.
_____ 1. What is the observable change in the allele frequencies of a population
over time called?
a. selection
b. microevolution
c. distribution
d. recombination
_____ 2. Natural selection that changes the distribution of a trait to favor one
extreme phenotype is called
a. disruptive selection.
b. stabilizing selection.
c. normalizing selection.
d. directional selection.
_____ 3. In stabilizing selection, what occurs in a population?
a. The population shifts toward one of two extreme phenotypes.
b. Both extreme phenotypes shift toward the middle.
c. The intermediate phenotype becomes more common.
d. The intermediate phenotype becomes rare.
_____ 4. A population that is not undergoing natural selection displays what
type of distribution?
a. normal
b. disruptive
c. directional
d. stabilizing
_____ 5. In a population of birds, intermediate beak size is selected against, and
both very small and very large beak sizes are favored. What type of
selection is this an example of?
a. directional
b. disruptive
c. normal
d. stabilizing
Copyright © McDougal Littell/Houghton Mifflin Company.
Biology
2
The Evolution of Populations