BIO 152 EXAM WITH CORRECT
ANSWERS 2025
Imagine the following sequence of events. Two populations are
divided into two geographically isolated subpopulations. The
subpopulations begin to accumulate independent genetic
changes in their gene pools. Some of those changes result in pre
zygotic reproductive isolating mechanisms. What process is
described above? correct answers >> Speciation
At the beginning of this study a keystone predatory was present
in both areas. In one area the keystone was removed (blue line)
shortly after the study began. In both areas the number of other
species of animals was counted. What does the above graph tell
you about a keystone species? correct answers >> A
keystone species removed forma community could have drastic
effects
In the western United States a rodent called a Prairie Dog lives in
groups called Prairie Dog towns and they
build a system of tunnels in grassland and shrub habitats. This
tunnel system provides a means of irrigating the
otherwise dry soils. As a result a greater diversity and density of
plants can grow in areas with Prairie Dog towns.
In addition, the plant growth attracts a whole series of species
that feed on the grass. Predators are also attracted to
the towns to prey on Prairie dogs and the other species of animals
their towns attracts. Prairie Dog numbers and
biomass are only a small part of the ecological community this
species attracts. Based on the information in the
,passage above, we can consider Prairie Dogs to be a: correct
answers >> Keystone species
A small population of white-footed deer mice has the same
intrinsic rate of increase as a large population. If
everything else is equal, correct answers >> the large
population will add more individuals per unit of time
i. small island that is close to the mainland
ii. small island that is far form the mainland
iii. large island that is close to the mainland
iv. large island that is far from the mainland
These islands are volcanic islands that all emerged from the
ocean floor at the same time and have been around for about
100,000 years. They are in a zone where the climate is the same.
correct answers >> iii. Large island that is close to the mainland
i. small island that is close to the mainland
ii. small island that is far form the mainland
iii. large island that is close to the mainland
iv. large island that is far from the mainland
When a large intact forest is cut, many parcels of forest are left
behind. This process is referred to as forest
fragmentation. The remaining stands of forest can be considered
habitat islands. These habitats islands have
characteristics most like: correct answers >> ii. small island
that is far from the mainland
, When the reproductive structures of plants are treated with the
compound colchicine it usually disrupts the movement of
chromosomes while pollen and eggs are forming. As a result
many of the offspring of these treated plants end up with higher
than normal chromosome numbers. Often these offspring can self
pollinate, but will not
cross-pollinate with their parents or other members of their
parent species. These new plants are considered
________ and were created by a process analogous to ___________.
(pick the pair of terms that best fill sin the blanks) correct
answers >> polyploid : sympatric speciation
Which of the following situations would represent a problem in
applying the biological species concept? correct answers >>
two populations of asexual clonal organisms that are
morphologically similar
Which of the following would best be described as a case of
speciation in sympatry? correct answers >> An individual
hermaphroditic plant undergoes meiotic failure, producing diploid
pollen and ovules; these self-fertilize, germinate, and grow into
several fully fertile tetraploid plants
The different species of Galapagos finches developed from a
single mainland ancestral finch through correct answers >>
an adaptive radiation
True or false: A mating season specific to each species is a form
of pre zygotic isolation correct answers >> True
ANSWERS 2025
Imagine the following sequence of events. Two populations are
divided into two geographically isolated subpopulations. The
subpopulations begin to accumulate independent genetic
changes in their gene pools. Some of those changes result in pre
zygotic reproductive isolating mechanisms. What process is
described above? correct answers >> Speciation
At the beginning of this study a keystone predatory was present
in both areas. In one area the keystone was removed (blue line)
shortly after the study began. In both areas the number of other
species of animals was counted. What does the above graph tell
you about a keystone species? correct answers >> A
keystone species removed forma community could have drastic
effects
In the western United States a rodent called a Prairie Dog lives in
groups called Prairie Dog towns and they
build a system of tunnels in grassland and shrub habitats. This
tunnel system provides a means of irrigating the
otherwise dry soils. As a result a greater diversity and density of
plants can grow in areas with Prairie Dog towns.
In addition, the plant growth attracts a whole series of species
that feed on the grass. Predators are also attracted to
the towns to prey on Prairie dogs and the other species of animals
their towns attracts. Prairie Dog numbers and
biomass are only a small part of the ecological community this
species attracts. Based on the information in the
,passage above, we can consider Prairie Dogs to be a: correct
answers >> Keystone species
A small population of white-footed deer mice has the same
intrinsic rate of increase as a large population. If
everything else is equal, correct answers >> the large
population will add more individuals per unit of time
i. small island that is close to the mainland
ii. small island that is far form the mainland
iii. large island that is close to the mainland
iv. large island that is far from the mainland
These islands are volcanic islands that all emerged from the
ocean floor at the same time and have been around for about
100,000 years. They are in a zone where the climate is the same.
correct answers >> iii. Large island that is close to the mainland
i. small island that is close to the mainland
ii. small island that is far form the mainland
iii. large island that is close to the mainland
iv. large island that is far from the mainland
When a large intact forest is cut, many parcels of forest are left
behind. This process is referred to as forest
fragmentation. The remaining stands of forest can be considered
habitat islands. These habitats islands have
characteristics most like: correct answers >> ii. small island
that is far from the mainland
, When the reproductive structures of plants are treated with the
compound colchicine it usually disrupts the movement of
chromosomes while pollen and eggs are forming. As a result
many of the offspring of these treated plants end up with higher
than normal chromosome numbers. Often these offspring can self
pollinate, but will not
cross-pollinate with their parents or other members of their
parent species. These new plants are considered
________ and were created by a process analogous to ___________.
(pick the pair of terms that best fill sin the blanks) correct
answers >> polyploid : sympatric speciation
Which of the following situations would represent a problem in
applying the biological species concept? correct answers >>
two populations of asexual clonal organisms that are
morphologically similar
Which of the following would best be described as a case of
speciation in sympatry? correct answers >> An individual
hermaphroditic plant undergoes meiotic failure, producing diploid
pollen and ovules; these self-fertilize, germinate, and grow into
several fully fertile tetraploid plants
The different species of Galapagos finches developed from a
single mainland ancestral finch through correct answers >>
an adaptive radiation
True or false: A mating season specific to each species is a form
of pre zygotic isolation correct answers >> True
