Bio 152 Exam -3 questions with correct
answers
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? - verified 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? - verified 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: - verified 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, - verified 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. -
verified 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: - verified 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
answers
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? - verified 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? - verified 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: - verified 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, - verified 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. -
verified 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: - verified 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
