Lowell Biology Ch15: Question Preview (ID: 29053)


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As a population reaches its carrying capacity, there is an increase competition for
a) Food b) Shelter c) Mates d) All of the above
Regarding population dispersion patterns, which of the following is an inappropriate pairing
a) Random spaced- chance b) Evenly spaced- regular intervals c) Clumped- cluster d) Dispersive- randomly distributed
The range of phenotypes shifts toward one extreme in
a) Stabilizing selection b) Disruptive selection c) Directional selection d) Polygenic selection
Because individuals in a population usually tend to produce more than one offspring
a) Populations tend to increase in size b) Population remain stable in size c) Individuals tend to die quickly d) The number of individuals decline rapidly
Which of the following is a density dependent factor
a) Disease b) Fire c) Pollution d) Temperature
Demographic studies of a population must take into consideration
a) Population size b) Population density c) Population dispersion d) All of the above
In 1908, Hardy and Weinberg independently demonstrated that
a) r- and K-strategist populations are actually the same b) Recessive alleles replace dominent alleles in a population over long periods of time c) Dominent alleles do not replace recessive alleles in a population d) Recessive alleles are usually more common than dominant alleles
Which of the following is a density-independent limiting factor
a) Food b) Fire c) disease d) Nesting sites
Which of the following does not represent a population
a) All the robins in Austin, Texas b) All the grass frogs in the pond of Central Park, NYC c) All the birds in Chicago d) All the earthworms in Yosemite National Park
Very small populations are less likely to become extinct than larger populations
a) True b) False c) d)
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 c) d)
The study of demographics help predict changes in the size of a population
a) True b) False c) d)
An example of a density-dependent limiting factor is a hurricane
a) True b) False c) d)
Natural selection acts on phenotypes, not genotypes
a) True b) False c) d)
Food supply is a density-dependent limiting factor
a) True b) False c) d)
Directional selection results in the range of phenotypes shifting toward one extreme
a) True b) false c) d)
The movement of alleles into or out of a population due to migration is called
a) mutation b) Gene flow c) Nonrandom mating d) Natural selection
Actual proportions of homozygotes and heterozygotes can differ from Hardy-Weinberg prediction because of
a) The occurrence of mutation b) Nonrandom mating among individuals c) Genetic drift within the population d) All of the above
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