BIO 1082 FULL FINAL EXAM REVIEW (JUST RELEASED) CURRENTLY TESTING WITH
VERIFIED ANSWERS
Which of the following agents of evolution adapts populations to their environment?
A. Natural selection
B. Nonrandom mating
C. Gene flow
D. Genetic drift
Natural selection
Which of the following statements is false?
A. Darwin's theory of evolution by natural selection was influenced by his experiences
as a pigeon breeder.
B. Individuals evolve according to Darwin's theory.
C. Death rates in nature are usually high.
D. Offspring tend to resemble their parents.
Individuals evolve according to Darwin's theory
In a hypothetical population of sawflies, 20 percent is homozygous for allele a.
Assuming that A and a are the only alleles at this locus, what percent of the population
is heterozygous?
A. 10 percent
B. 20 percent
C. 35 percent
D. 45 percent
,35 percent
Assuming that there are only two alleles at a given locus, if the frequency of one allele
is 0.6, what is the frequency of the other allele?
A. -0.6
B. 0
C. 0.4
D. 0.6
E. 1
0.4
The ultimate origin of genetic variation is
A. genetic drift
B. mutation
C. natural selection
D. nonrandom mating
mutation
If a population with two alleles is at Hardy-Weinberg equilibrium and the frequency of
one allele is 0.7, what is the heterozygote frequency?
A. 0.7
B. 0.42
C. 0.3
D. 0.21
,0.42
Which of the following is not required for a population at Hardy-Weinberg equilibrium?
A. There is no migration between populations
B. Natural Selections is not acting on the alleles in the population
C. Mating is random
D. Multiple alleles must be present at every locus
Multiple alleles must be present at every locus
Due to various causes, including DDT poisoning, the population size of whooping
cranes was reduced to about a dozen during the 1970s. The population size has since
rebounded, and there are now hundreds of whooping cranes. Which of the following
would you not expect to see in whooping cranes?
A. Very low levels of genetic variation
B. Very few heterozygous individuals
C. Differences in allele frequency between current populations of cranes and
historical populations
D. Considerable genetic polymorphism
Considerable genetic polymorphism
Natural selection works _______ on the genotype and _______ on the phenotype.
A. directly; directly
B. directly; indirectly
C. directly; not at all
, D. indirectly; directly
indirectly; directly
Which of the following modes of selection arises when individuals at both extremes of
the distribution have high fitness?
A. Stabilizing selection
B. Directional selection
C. Disruptive selection
D. Both a and b
Disruptive selection
Suppose that females of a species of beetles prefer to mate with males that have
relatively rare color patterns. This observation would be an illustration of
A. genetic drift.
B. the founder effect.
C. frequency-dependent selection.
D. disruptive selection.
frequency-dependent selection
Random genetic drift would probably have its greatest effect on a
A. small, isolated population.
B. large population in which mating is nonrandom.
C. large population in which mating is random.
D. large population with regular immigration from a neighboring population.
VERIFIED ANSWERS
Which of the following agents of evolution adapts populations to their environment?
A. Natural selection
B. Nonrandom mating
C. Gene flow
D. Genetic drift
Natural selection
Which of the following statements is false?
A. Darwin's theory of evolution by natural selection was influenced by his experiences
as a pigeon breeder.
B. Individuals evolve according to Darwin's theory.
C. Death rates in nature are usually high.
D. Offspring tend to resemble their parents.
Individuals evolve according to Darwin's theory
In a hypothetical population of sawflies, 20 percent is homozygous for allele a.
Assuming that A and a are the only alleles at this locus, what percent of the population
is heterozygous?
A. 10 percent
B. 20 percent
C. 35 percent
D. 45 percent
,35 percent
Assuming that there are only two alleles at a given locus, if the frequency of one allele
is 0.6, what is the frequency of the other allele?
A. -0.6
B. 0
C. 0.4
D. 0.6
E. 1
0.4
The ultimate origin of genetic variation is
A. genetic drift
B. mutation
C. natural selection
D. nonrandom mating
mutation
If a population with two alleles is at Hardy-Weinberg equilibrium and the frequency of
one allele is 0.7, what is the heterozygote frequency?
A. 0.7
B. 0.42
C. 0.3
D. 0.21
,0.42
Which of the following is not required for a population at Hardy-Weinberg equilibrium?
A. There is no migration between populations
B. Natural Selections is not acting on the alleles in the population
C. Mating is random
D. Multiple alleles must be present at every locus
Multiple alleles must be present at every locus
Due to various causes, including DDT poisoning, the population size of whooping
cranes was reduced to about a dozen during the 1970s. The population size has since
rebounded, and there are now hundreds of whooping cranes. Which of the following
would you not expect to see in whooping cranes?
A. Very low levels of genetic variation
B. Very few heterozygous individuals
C. Differences in allele frequency between current populations of cranes and
historical populations
D. Considerable genetic polymorphism
Considerable genetic polymorphism
Natural selection works _______ on the genotype and _______ on the phenotype.
A. directly; directly
B. directly; indirectly
C. directly; not at all
, D. indirectly; directly
indirectly; directly
Which of the following modes of selection arises when individuals at both extremes of
the distribution have high fitness?
A. Stabilizing selection
B. Directional selection
C. Disruptive selection
D. Both a and b
Disruptive selection
Suppose that females of a species of beetles prefer to mate with males that have
relatively rare color patterns. This observation would be an illustration of
A. genetic drift.
B. the founder effect.
C. frequency-dependent selection.
D. disruptive selection.
frequency-dependent selection
Random genetic drift would probably have its greatest effect on a
A. small, isolated population.
B. large population in which mating is nonrandom.
C. large population in which mating is random.
D. large population with regular immigration from a neighboring population.
