BIO 152 EXAM 2 WITH CORRECT
ANSWERS 2025
What does the biological species concept use as the primary
criterion for determining species boundaries?
A. Geographic isolation
B. Niche differences
C. Gene flow
D. Morphological similarity
E. Molecular similarity correct answers >> C
When you use a field guide to identify a species by its
appearance, you are applying the:
A. Evolutionary species concept
B. Biological species concept
C. Morphospecies concept
D. Ecological species concept correct answers >> C
A drawback of the BSC is that it can't be applied to:
A. Polymorphic species
B. Asexual organisms
C. Extinct organisms
D. Plants correct answers >> B&C
A bacteriologist is studying two asexually reproducing strains of
Ecoli. The two require different amounts of trace minerals for
,survival; on these grounds, the bacteriologist determines that
they are separate species. In making his determination, he is
using what species concept?
A. Evolutionary species concept
B. Ecological species concept
C. Biological species concept
D. Morphospecies concept correct answers >> B
Two species of frog mate in the same pond. One breeds in early
summer and one in late summer. This is an example of what kind
of reproductive isolation?
A. Post zygotic, temporal separation
B. Pre zygotic, temporal separation
C. Post zygotic, ecological separation
D. Pre zygotic, behavioral isolation
E. Pre zygotic, ecological separation correct answers >> B
It is thought that polar bears originated from a population of
brown bears that became geographically isolated during a
glaciation event that occurred about 150,000 years ago. This is an
example of:
A. Sympatric speciation
B. Allopatric speciation
C. Peripatetic speciation
D. Adaptive radiation correct answers >> B
_ is a special case of speciation in which new species form rapidly
in response to numerous open ecological niches.
,A. Sympatric speciation
B. Co speciation
C. Allopatric speciation
D. Post zygotic radiation
E. Adaptive radiation correct answers >> E
_ is the process in which two groups of organisms speciate in
response to each other and at the same time.
A. Sympatric speciation
B. Co speciation
C. Allopatric speciation
D. Post zygotic isolation
E. Adaptive radiation correct answers >> B
You begin an experiment with 2 populations of Ecoli that are each
composed of 100 cells. The cells are all genetically identical. You
grow these populations in flasks on a lab bench under identical
conditions with unlimited resources. Even after many generations
natural selection can't occur because bacteria are haploid so
there is no individual variation.
A. True
B. False correct answers >> B
You are confronted with a box of preserved grasshoppers of
various species that are new to science and have not been
described. Your assignment is to separate them into species.
There is no accompanying information as to where or when they
were collected. Which species concept will you have to use?
, A. Biological
B. Evolutionary
C. Ecological
D. Morphological correct answers >> D
_ is the process in which two groups of organisms living the same
habitat diverge into separate species.
A. Adaptive radiation
B. Perpatric special
C. Co speciation
D. Sympatric speciation correct answers >> D
Two closely related populations of mice have been separated for
many generations by a river. Climatic change causes the river to
dry up, thereby bringing the mice populations back into contact in
a zone of overlap. Which of the following is not a possible
outcome when they meet?
A. Interbreed freely & produce fertile hybrid offspring
B. No longer attempt to interbreed
C. Interbreed in the region of overlap, producing an inferior
hybrid. Subsequent interbreeding between inferior hybrids
produces progressively superior hybrids over several generations
D. Remain separate in the extremes of their ranges but develop a
persistent hybrid zone in the area overlap
E. Interbreed in the region of overlap, but produce sterile
offspring correct answers >> C
Gene flow may change allele frequencies in population.
ANSWERS 2025
What does the biological species concept use as the primary
criterion for determining species boundaries?
A. Geographic isolation
B. Niche differences
C. Gene flow
D. Morphological similarity
E. Molecular similarity correct answers >> C
When you use a field guide to identify a species by its
appearance, you are applying the:
A. Evolutionary species concept
B. Biological species concept
C. Morphospecies concept
D. Ecological species concept correct answers >> C
A drawback of the BSC is that it can't be applied to:
A. Polymorphic species
B. Asexual organisms
C. Extinct organisms
D. Plants correct answers >> B&C
A bacteriologist is studying two asexually reproducing strains of
Ecoli. The two require different amounts of trace minerals for
,survival; on these grounds, the bacteriologist determines that
they are separate species. In making his determination, he is
using what species concept?
A. Evolutionary species concept
B. Ecological species concept
C. Biological species concept
D. Morphospecies concept correct answers >> B
Two species of frog mate in the same pond. One breeds in early
summer and one in late summer. This is an example of what kind
of reproductive isolation?
A. Post zygotic, temporal separation
B. Pre zygotic, temporal separation
C. Post zygotic, ecological separation
D. Pre zygotic, behavioral isolation
E. Pre zygotic, ecological separation correct answers >> B
It is thought that polar bears originated from a population of
brown bears that became geographically isolated during a
glaciation event that occurred about 150,000 years ago. This is an
example of:
A. Sympatric speciation
B. Allopatric speciation
C. Peripatetic speciation
D. Adaptive radiation correct answers >> B
_ is a special case of speciation in which new species form rapidly
in response to numerous open ecological niches.
,A. Sympatric speciation
B. Co speciation
C. Allopatric speciation
D. Post zygotic radiation
E. Adaptive radiation correct answers >> E
_ is the process in which two groups of organisms speciate in
response to each other and at the same time.
A. Sympatric speciation
B. Co speciation
C. Allopatric speciation
D. Post zygotic isolation
E. Adaptive radiation correct answers >> B
You begin an experiment with 2 populations of Ecoli that are each
composed of 100 cells. The cells are all genetically identical. You
grow these populations in flasks on a lab bench under identical
conditions with unlimited resources. Even after many generations
natural selection can't occur because bacteria are haploid so
there is no individual variation.
A. True
B. False correct answers >> B
You are confronted with a box of preserved grasshoppers of
various species that are new to science and have not been
described. Your assignment is to separate them into species.
There is no accompanying information as to where or when they
were collected. Which species concept will you have to use?
, A. Biological
B. Evolutionary
C. Ecological
D. Morphological correct answers >> D
_ is the process in which two groups of organisms living the same
habitat diverge into separate species.
A. Adaptive radiation
B. Perpatric special
C. Co speciation
D. Sympatric speciation correct answers >> D
Two closely related populations of mice have been separated for
many generations by a river. Climatic change causes the river to
dry up, thereby bringing the mice populations back into contact in
a zone of overlap. Which of the following is not a possible
outcome when they meet?
A. Interbreed freely & produce fertile hybrid offspring
B. No longer attempt to interbreed
C. Interbreed in the region of overlap, producing an inferior
hybrid. Subsequent interbreeding between inferior hybrids
produces progressively superior hybrids over several generations
D. Remain separate in the extremes of their ranges but develop a
persistent hybrid zone in the area overlap
E. Interbreed in the region of overlap, but produce sterile
offspring correct answers >> C
Gene flow may change allele frequencies in population.
