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?
Give this one a try later!
Speciation
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:
Give this one a try later!
Keystone species
What do we call fossils that show changes from one form of organism to another?
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Transitional
Imagine the following sequence of events. Two subpopulations of the same species
are located in the
same area. The subpopulations begin to accumulate independent genetic changes in
their gene pools.
Some of those changes result in prezygotic reproductive isolating mechanisms. What
process is described
above?
Give this one a try later!
Sympatric Speciation
, What is the Pitx1 gene responsible for in the embryonic development of mice?
(homologies between
stickleback fish and mice will help you with this one)?
Give this one a try later!
It is responsible for differences in the development of the hind and fore
limbs
All of the following could act as reproductive isolating mechanisms except?
a) structural differences between male external reproductive organs in different
species of millipedes
b) difference in the timing of breeding seasons of frogs
c) differences in food preferences between two populations of birds
d) differences in courtship song between two populations of meadowlarks
e) failure of meiosis (gamete formation) in hybrids formed between two populations
of insects
Give this one a try later!
c. differences in food preferences between two populations of birds
Which of the following correctly describes a species?
a. members of a species can interbreed
b. members of a species have a shared gene pool
c. members are unable to successfully breed with members of other species
d. all of the above
Give this one a try later!
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?
Give this one a try later!
Speciation
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:
Give this one a try later!
Keystone species
What do we call fossils that show changes from one form of organism to another?
Give this one a try later!
Transitional
Imagine the following sequence of events. Two subpopulations of the same species
are located in the
same area. The subpopulations begin to accumulate independent genetic changes in
their gene pools.
Some of those changes result in prezygotic reproductive isolating mechanisms. What
process is described
above?
Give this one a try later!
Sympatric Speciation
, What is the Pitx1 gene responsible for in the embryonic development of mice?
(homologies between
stickleback fish and mice will help you with this one)?
Give this one a try later!
It is responsible for differences in the development of the hind and fore
limbs
All of the following could act as reproductive isolating mechanisms except?
a) structural differences between male external reproductive organs in different
species of millipedes
b) difference in the timing of breeding seasons of frogs
c) differences in food preferences between two populations of birds
d) differences in courtship song between two populations of meadowlarks
e) failure of meiosis (gamete formation) in hybrids formed between two populations
of insects
Give this one a try later!
c. differences in food preferences between two populations of birds
Which of the following correctly describes a species?
a. members of a species can interbreed
b. members of a species have a shared gene pool
c. members are unable to successfully breed with members of other species
d. all of the above
Give this one a try later!
