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Lowell Biology Ch15
Test Description: Biology ch15
Instructions: Answer all questions to get your test result.
1) Food supply is a density-dependent limiting factor
A
True
B
False
2) Directional selection results in the range of phenotypes shifting toward one extreme
A
false
B
True
3) An example of a density-dependent limiting factor is a hurricane
A
False
B
True
4) Natural selection acts on phenotypes, not genotypes
A
True
B
False
5) The study of demographics help predict changes in the size of a population
A
True
B
False
6) Natural selection always eliminates any genetic disorders from a population, regardless of the frequency of the gene that is responsible for a disorder
A
True
B
False
7) Very small populations are less likely to become extinct than larger populations
A
True
B
False
8) Which of the following is a density-independent limiting factor
A
Nesting sites
B
Food
C
Fire
D
disease
9) Which of the following does not represent a population
A
All the earthworms in Yosemite National Park
B
All the grass frogs in the pond of Central Park, NYC
C
All the robins in Austin, Texas
D
All the birds in Chicago
10) Demographic studies of a population must take into consideration
A
Population dispersion
B
All of the above
C
Population density
D
Population size
11) In 1908, Hardy and Weinberg independently demonstrated that
A
Recessive alleles replace dominent alleles in a population over long periods of time
B
Dominent alleles do not replace recessive alleles in a population
C
Recessive alleles are usually more common than dominant alleles
D
r- and K-strategist populations are actually the same
12) Which of the following is a density dependent factor
A
Fire
B
Temperature
C
Pollution
D
Disease
13) Because individuals in a population usually tend to produce more than one offspring
A
Individuals tend to die quickly
B
The number of individuals decline rapidly
C
Populations tend to increase in size
D
Population remain stable in size
14) The range of phenotypes shifts toward one extreme in
A
Disruptive selection
B
Stabilizing selection
C
Polygenic selection
D
Directional selection
15) Regarding population dispersion patterns, which of the following is an inappropriate pairing
A
Clumped- cluster
B
Evenly spaced- regular intervals
C
Dispersive- randomly distributed
D
Random spaced- chance
16) As a population reaches its carrying capacity, there is an increase competition for
A
All of the above
B
Food
C
Shelter
D
Mates
17) The movement of alleles into or out of a population due to migration is called
A
Gene flow
B
mutation
C
Natural selection
D
Nonrandom mating
18) Actual proportions of homozygotes and heterozygotes can differ from Hardy-Weinberg prediction because of
A
Nonrandom mating among individuals
B
All of the above
C
Genetic drift within the population
D
The occurrence of mutation
*select an answer for all questions
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