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Multiple Choice Quiz
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1

Which of the following is not an assumption of the Hardy-Weinberg equilibrium?
A)Mating occurs preferentially.
B)The size of the population is large.
C)There is no migration.
D)There are no mutations.

  1. The population size is large.
  2. Random mating is occurring.
  3. No mutation takes place.
  4. No genes are input from other sources (no immigration takes place)
  5. No selection occurs.

Because their proportions do not change, the genotypes are said to be in Hardy-Weinberg equilibrium.



2

In a population of red (dominant allele) or white flowers, the frequency of red flowers is 91%. What is the frequency of the red allele?
A)9%
B)30%
C)91%
D)70%
3

Which of the following describes gene flow?
A)random mating
B)migration
C)genetic drift
D)selection
4

Which of the following conditions is not needed for natural selection to occur in a population?
A)Individuals must be able to move between populations.
B)Variation must be genetically inherited.
C)Certain variations allow an individual to produce more offspring that survive in the next generation.
D)There must be variations in the phenotypes of individuals in the population.
5

Which of the following is the ultimate source of genetic variation in a population?
A)gene flow
B)assortive mating
C)mutation
D)selection
6

Natural selection can be countered by which of the following?
A)genetic drift
B)gene flow
C)mutation
D)All of the above can counter natural selection in some way.
7

The maintenance of the sickle cell allele in human populations in central Africa is an example of
A)gene flow.
B)heterozygote advantage.
C)genetic drift.
D)nonrandom mating.
8

What would happen in the U.S. if malaria once again became a widespread disease?
A)Over time, the sickle cell allele would become more prevalent in the population.
B)Many individuals in the population would die of malaria.
C)Individuals who were heterozygous for the sickle cell allele would be less susceptible to malaria.
D)All of these events would occur.
9

____________ operates to eliminate intermediate phenotypes.
A)Directional selection
B)Disruptive selection
C)Stabilizing selection
D)Random chance
10

When transplanted to streams above waterfalls, guppy populations evolved more spots because
A)predators are not present.
B)they consumed different sources of food.
C)spots make guppies harder to see against their background.
D)all of the above







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