BIO 152 ROUNDS FINAL EXAM WITH
CORRECT ANSWERS 2025
In the c. coli long-term evolution experiment, the mutation
allowing the e. coli to metabolize citrate occurred because the e.
coli were growing on citrate. That is, if the e. coli were growing in
some other condition, the mutation would not have happened.
correct answers >> false
Why did it take so many generations for the e. coli to be able to
grow on citrate?
Select one:
a. because e. coli grows much more slowly on citrate.
b. It needed to use up the glucose first
c. because mutations are random and just need to happen
d. because citrate is a very complicated molecule. correct
answers >> c. because mutations are random and just need to
happen
Which of the following is necessary for evolution by natural
selection?
Select one or more:
a. Variation in heritable traits in the population
b. Differences in lifetime reproductive success based on traits
c. there must be sexual reproduction
d. some dramatic change in the environment. correct answers
>> a. variation in heritable traits in the population
b. differences in lifetime reproductive success based on traits
,Teosinte is a grass that grows wild in central America and
includes several different very similar species. Over the course of
thousands of years, the farmers of central American carefully
culled (got rid of so they couldn't' breed) undesirable offspring
and cross bred various teosinte species ultimately developing Zea
mays or what we usually call corn. Which of the following
statements is true regarding this process?
Select one:
a. This is not an example of evolution because humans did the
selection process.
b. It would be possible to carefully select modern corn plants to
ultimately wind up with teosinte.
c. The articifical selection applied by humans caused mutations in
teosinte leading to the development of corn.
d. This is an example of evolution through artificial selection.
correct answers >> d. This is an example of evolution through
artificial selection
The raw material for evolution is created by ____1___ mutations.
Natural selection is a ___2______ process that acts upon the
subsequent phenotypes to result in evolution. correct answers
>> 1. random
2. non-random
1. Training at high altitude increases the hemoglobin in a cyclists
blood
2. If you move from a cold to a hot climate, the salt content of
your sweat will eventually go down.
,3. A rare allele of a gene called EPAS1 helps people thrive at low
oxygen concentrations whereas the more common allele is not as
helpful. Most Tibetans have the rare allele whereas their close (at
least genetically) relatives the Han Chinese usually have the
common allele. In the Tibetans this is an example of.
4. The big ears of the long eared jerboa help it radiate heat int he
desert correct answers >> 1. acclimatization
2. acclimatization
3. adaptation
4. adaptation
From an evolutionary perspective, germ-line mutations are more
significant than somatic mutations. This is because:
Select one:
a. somatic mutations don't affect the genomes of any cells
b. somatic mutations are generally harmful
c. only germ line mutations will appear in an individual's
descendants
d. only germ-line mutations can be harmful correct answers
>> c. only germ line mutations will appear in an individual's
descendants
All the alleles present in all individuals in a species are referred to
as the ____________ of that species.
a. gene pool
b. allele frequency
c. genotype frequency
d. genotype
, e. phenotype correct answers >> gene pool
In a population of butterflies has the following gene frequencies:
40% AA, 10% Aa, and 50% aa. What is the frequency of the a
allele?
a. 0.5
b. 0.6
c. 0.55
d. 0.4
e. 0.35 correct answers >> 0.55
match the description with the phrase:
1.Evolution always involves
2. Evolution sometimes involves
3. Evolution never involves correct answers >> 1. changes in
species over time such that descendants differ from ancestors
2. selection of the most fit phenotype and genotype
3. an increase in allelic diversity in response to environmental
change
Which of the following is a true with respect to genetic variation?
a. Genetic variation is created by natural selection.
b. It arises in response to environmental change.
c. It must be present in a population before natural selection can
act upon the population.
CORRECT ANSWERS 2025
In the c. coli long-term evolution experiment, the mutation
allowing the e. coli to metabolize citrate occurred because the e.
coli were growing on citrate. That is, if the e. coli were growing in
some other condition, the mutation would not have happened.
correct answers >> false
Why did it take so many generations for the e. coli to be able to
grow on citrate?
Select one:
a. because e. coli grows much more slowly on citrate.
b. It needed to use up the glucose first
c. because mutations are random and just need to happen
d. because citrate is a very complicated molecule. correct
answers >> c. because mutations are random and just need to
happen
Which of the following is necessary for evolution by natural
selection?
Select one or more:
a. Variation in heritable traits in the population
b. Differences in lifetime reproductive success based on traits
c. there must be sexual reproduction
d. some dramatic change in the environment. correct answers
>> a. variation in heritable traits in the population
b. differences in lifetime reproductive success based on traits
,Teosinte is a grass that grows wild in central America and
includes several different very similar species. Over the course of
thousands of years, the farmers of central American carefully
culled (got rid of so they couldn't' breed) undesirable offspring
and cross bred various teosinte species ultimately developing Zea
mays or what we usually call corn. Which of the following
statements is true regarding this process?
Select one:
a. This is not an example of evolution because humans did the
selection process.
b. It would be possible to carefully select modern corn plants to
ultimately wind up with teosinte.
c. The articifical selection applied by humans caused mutations in
teosinte leading to the development of corn.
d. This is an example of evolution through artificial selection.
correct answers >> d. This is an example of evolution through
artificial selection
The raw material for evolution is created by ____1___ mutations.
Natural selection is a ___2______ process that acts upon the
subsequent phenotypes to result in evolution. correct answers
>> 1. random
2. non-random
1. Training at high altitude increases the hemoglobin in a cyclists
blood
2. If you move from a cold to a hot climate, the salt content of
your sweat will eventually go down.
,3. A rare allele of a gene called EPAS1 helps people thrive at low
oxygen concentrations whereas the more common allele is not as
helpful. Most Tibetans have the rare allele whereas their close (at
least genetically) relatives the Han Chinese usually have the
common allele. In the Tibetans this is an example of.
4. The big ears of the long eared jerboa help it radiate heat int he
desert correct answers >> 1. acclimatization
2. acclimatization
3. adaptation
4. adaptation
From an evolutionary perspective, germ-line mutations are more
significant than somatic mutations. This is because:
Select one:
a. somatic mutations don't affect the genomes of any cells
b. somatic mutations are generally harmful
c. only germ line mutations will appear in an individual's
descendants
d. only germ-line mutations can be harmful correct answers
>> c. only germ line mutations will appear in an individual's
descendants
All the alleles present in all individuals in a species are referred to
as the ____________ of that species.
a. gene pool
b. allele frequency
c. genotype frequency
d. genotype
, e. phenotype correct answers >> gene pool
In a population of butterflies has the following gene frequencies:
40% AA, 10% Aa, and 50% aa. What is the frequency of the a
allele?
a. 0.5
b. 0.6
c. 0.55
d. 0.4
e. 0.35 correct answers >> 0.55
match the description with the phrase:
1.Evolution always involves
2. Evolution sometimes involves
3. Evolution never involves correct answers >> 1. changes in
species over time such that descendants differ from ancestors
2. selection of the most fit phenotype and genotype
3. an increase in allelic diversity in response to environmental
change
Which of the following is a true with respect to genetic variation?
a. Genetic variation is created by natural selection.
b. It arises in response to environmental change.
c. It must be present in a population before natural selection can
act upon the population.
