Question 1

Which of the following would NOT be expected after a population undergoes geographic isolation?

Accepted Answer

A) a decrease in gene flow 
B) an increase in gene flow 
C) allopatric speciation 
D) formation of adaptive traits 
A) a decrease in gene flow 
B) an increase in gene flow 
C) allopatric speciation 
D) formation of adaptive traits B

Question 2

Populations within a species are connected by

Accepted Answer

A) gene flow. 
B) speciation. 
C) continental drift. 
D) genetic drift. 
A) gene flow. 
B) speciation. 
C) continental drift. 
D) genetic drift. A

Question 3

This figure shows two squirrels that represent two separate species.Explain how the geographic barrier between these two populations led to the formation of two distinct species.

Accepted Answer

Geographic barriers prevent gene flow between populations of a species.Given enough time,a lack of gene flow between two populations leads to genetic divergence as mechanisms of evolution,such as mutation,genetic drift,and natural selection,occur.This is an example of allopatric speciation.

Question 4

________ speciation can occur when populations of a species are separated by a physical barrier,thereby becoming geographically isolated and subsequently reproductively isolated from one another.

Accepted Answer

The answer of ________ speciation can occur when populations of...

Question 5

A rainforest is a highly complex habitat with organisms living at various levels in the trees,on the ground,and underground.Is it possible to consider two populations of insects living in the same tree to be geographically isolated?

Accepted Answer

A) No,because if they are in the same tree,they are in the same geographic area. 
B) No,because if they are in the same square acre,they cannot be considered geographically isolated. 
C) Yes,because insects only undergo allopatric speciation,and there are many species of insects. 
D) Yes,because there are so many habitats in one tree that the populations may never interact. 
A) No,because if they are in the same tree,they are in the same geographic area. 
B) No,because if they are in the same square acre,they cannot be considered geographically isolated. 
C) Yes,because insects only undergo allopatric speciation,and there are many species of insects. 
D) Yes,because there are so many habitats in one tree that the populations may never interact.

Question 6

Two species live in the same area but breed in different parts of their habitat.These species are

Accepted Answer

A) geographically isolated. 
B) ecologically isolated. 
C) artificially isolated. 
D) likely to produce hybrids. 
A) geographically isolated. 
B) ecologically isolated. 
C) artificially isolated. 
D) likely to produce hybrids.

Question 7

Choose two different reproductive barriers that lead to sympatric speciation and explain how they work.

Accepted Answer

Sympatric speciation occurs when new spe

Question 8

Which of the following examples does NOT illustrate a difference in fitness that would lead to evolution by natural selection?

Accepted Answer

A) Male peacocks with larger,more colorful tails are more frequently chosen as mates. 
B) Moths with coloration that allows them to blend in with the bark of spruce trees are more difficult for predators to find. 
C) Wolves who are more successful hunting in packs find mates more frequently. 
D) A female panda living in a zoo in China is impregnated more frequently than a female panda living in a zoo in the United States. 
A) Male peacocks with larger,more colorful tails are more frequently chosen as mates. 
B) Moths with coloration that allows them to blend in with the bark of spruce trees are more difficult for predators to find. 
C) Wolves who are more successful hunting in packs find mates more frequently. 
D) A female panda living in a zoo in China is impregnated more frequently than a female panda living in a zoo in the United States.

Question 9

Explain how a change in the depth,either a lengthening or shortening,of flowers that contain nectar eaten by a particular species of hummingbird would potentially lead to a change in the hummingbird.

Accepted Answer

If the nectar contained in these flowers

Question 10

The two squirrel species shown in the figure arose from the same ancestor.The Kaibab squirrel lives on the north rim of the Grand Canyon and Abert's squirrel lives on the south rim.Which is the most likely explanation for their speciation?

Accepted Answer

A) The population of ancestral squirrel occupied only one of the rims of the Grand Canyon.As the population grew,some members of the population crossed the Grand Canyon to form a new population. 
B) The population of the ancestral squirrel was split by the formation of the Grand Canyon.Since the habitats were different on each rim,the populations evolved differently and became reproductively isolated. 
C) When the Grand Canyon formed,competition for food and shelter became fierce.The two species arose through sympatric speciation as some individuals gathered food on the north rim rather than on the south rim. 
D) The ancestral squirrel was actually a hybrid of two squirrel species.When the populations were separated and could no longer mate,the characteristics of the two species became more obvious. 
A) The population of ancestral squirrel occupied only one of the rims of the Grand Canyon.As the population grew,some members of the population crossed the Grand Canyon to form a new population. 
B) The population of the ancestral squirrel was split by the formation of the Grand Canyon.Since the habitats were different on each rim,the populations evolved differently and became reproductively isolated. 
C) When the Grand Canyon formed,competition for food and shelter became fierce.The two species arose through sympatric speciation as some individuals gathered food on the north rim rather than on the south rim. 
D) The ancestral squirrel was actually a hybrid of two squirrel species.When the populations were separated and could no longer mate,the characteristics of the two species became more obvious.

Question 11

Individual organisms with inherited characteristics that enable them to survive and reproduce are said to have greater ________ fitness than individuals who fail to survive and reproduce.

Accepted Answer

The answer of Individual organisms with inherited characteristics that enable...

Question 12

Adaptive evolution

Accepted Answer

A) is large-scale movement of a single species over a new geographic area. 
B) occurs when a more adapted species causes the extinction of a less adapted one. 
C) is the process by which natural selection improves the match between an organism and its environment over time. 
D) is an increase in the adaptiveness of many species that have already evolved. 
A) is large-scale movement of a single species over a new geographic area. 
B) occurs when a more adapted species causes the extinction of a less adapted one. 
C) is the process by which natural selection improves the match between an organism and its environment over time. 
D) is an increase in the adaptiveness of many species that have already evolved.

Question 13

The red-breasted nuthatch and the white-breasted nuthatch are similar in appearance and,in many regions of the United States,their ranges overlap.The two organisms do not interbreed.Based on this information,red-breasted and white-breasted nuthatches are

Accepted Answer

A) different species. 
B) different populations of the same species. 
C) hybrids. 
D) polyploids. 
A) different species. 
B) different populations of the same species. 
C) hybrids. 
D) polyploids.

Question 14

Although populations of North American apple maggot flies are not geographically isolated,they appear to be in the process of diverging into two new species.Which of the following could be causing speciation between two populations in the lack of geographic isolation?

Accepted Answer

A) feeding on two different types of food 
B) producing fertile hybrids 
C) laying their eggs in the same location 
D) increased gene flow between them 
A) feeding on two different types of food 
B) producing fertile hybrids 
C) laying their eggs in the same location 
D) increased gene flow between them

Question 15

Bacteria reproduce asexually,so scientists classify them based on

Accepted Answer

A) the morphological species concept. 
B) reproductive isolation. 
C) the biological species concept. 
D) the idea that they are all strains of the same species. 
A) the morphological species concept. 
B) reproductive isolation. 
C) the biological species concept. 
D) the idea that they are all strains of the same species.

Question 16

Convergent evolution involves unrelated,or distantly related,organisms developing similar traits.How is coevolution similar to convergent evolution?

Accepted Answer

A) Coevolution also involves changes in unrelated,or distant,organisms. 
B) Coevolution,like convergent evolution,often occurs in geographic isolation. 
C) Coevolution is a process that occurs when food sources change. 
D) Coevolution also leads to similar traits developing in two species. 
A) Coevolution also involves changes in unrelated,or distant,organisms. 
B) Coevolution,like convergent evolution,often occurs in geographic isolation. 
C) Coevolution is a process that occurs when food sources change. 
D) Coevolution also leads to similar traits developing in two species.

Question 17

Which of the following organisms would best be identified as a species using the biological species concept?

Accepted Answer

A) a population of mice living on a mountaintop where the nearest population of mice is 50 miles away 
B) a bacteria found living in the human gut with thousands of other bacteria 
C) dinosaurs identified by morphologically similar fossil remains located in a single valley in South America 
D) a rare plant living in a remote location in Peru that reproduces asexually 
A) a population of mice living on a mountaintop where the nearest population of mice is 50 miles away 
B) a bacteria found living in the human gut with thousands of other bacteria 
C) dinosaurs identified by morphologically similar fossil remains located in a single valley in South America 
D) a rare plant living in a remote location in Peru that reproduces asexually

Question 18

Sympatric speciation

Accepted Answer

A) occurs only in plants. 
B) is impossible,because the populations of a species must be isolated from one another for speciation to occur. 
C) is always a result of polyploidy. 
D) occurs when a new species emerges from a population in the absence of a geographical barrier. 
A) occurs only in plants. 
B) is impossible,because the populations of a species must be isolated from one another for speciation to occur. 
C) is always a result of polyploidy. 
D) occurs when a new species emerges from a population in the absence of a geographical barrier.

Question 19

Match each numbered statement to one of terms listed below.
-process of evolution through natural selection

Accepted Answer

A) coevolution 
B) biological species concept 
C) morphological species concept 
D) speciation 
E) morphology
F)adaptation 
A) coevolution 
B) biological species concept 
C) morphological species concept 
D) speciation 
E) morphology
F)adaptation

Question 20

If two populations of beetles living in isolated areas are physically different but genetically similar,would they be considered one species or two? Explain your answer.

Accepted Answer

Although the physical differences may le

Which of the following would NOT be expected after a population undergoes geographic isolation?

Populations within a species are connected by

This figure shows two squirrels that represent two separate species.Explain how the geographic barrier between these two populations led to the formation of two distinct species.

________ speciation can occur when populations of a species are separated by a physical barrier,thereby becoming geographically isolated and subsequently reproductively isolated from one another.

A rainforest is a highly complex habitat with organisms living at various levels in the trees,on the ground,and underground.Is it possible to consider two populations of insects living in the same tree to be geographically isolated?

Two species live in the same area but breed in different parts of their habitat.These species are

Choose two different reproductive barriers that lead to sympatric speciation and explain how they work.

Which of the following examples does NOT illustrate a difference in fitness that would lead to evolution by natural selection?

Explain how a change in the depth,either a lengthening or shortening,of flowers that contain nectar eaten by a particular species of hummingbird would potentially lead to a change in the hummingbird.

The two squirrel species shown in the figure arose from the same ancestor.The Kaibab squirrel lives on the north rim of the Grand Canyon and Abert's squirrel lives on the south rim.Which is the most likely explanation for their speciation?

Individual organisms with inherited characteristics that enable them to survive and reproduce are said to have greater ________ fitness than individuals who fail to survive and reproduce.

Adaptive evolution

The red-breasted nuthatch and the white-breasted nuthatch are similar in appearance and,in many regions of the United States,their ranges overlap.The two organisms do not interbreed.Based on this information,red-breasted and white-breasted nuthatches are

Although populations of North American apple maggot flies are not geographically isolated,they appear to be in the process of diverging into two new species.Which of the following could be causing speciation between two populations in the lack of geographic isolation?

Bacteria reproduce asexually,so scientists classify them based on

Convergent evolution involves unrelated,or distantly related,organisms developing similar traits.How is coevolution similar to convergent evolution?

Which of the following organisms would best be identified as a species using the biological species concept?

Sympatric speciation

Match each numbered statement to one of terms listed below. -process of evolution through natural selection

If two populations of beetles living in isolated areas are physically different but genetically similar,would they be considered one species or two? Explain your answer.

The Nature of Science

Chemistry of Life

Life Is Cellular

How Cells Work

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

What Genes Are

How Genes Work

Evidence for Evolution

Mechanisms of Evolution

The History of Life

Human Evolution

General Principles of Ecology

Growth of Populations

Communities of Organisms

Ecosystems

Applying the Science

Filters

Exam 12: Adaptation and Species

Which of the following would NOT be expected after a population undergoes geographic isolation?

Populations within a species are connected by

This figure shows two squirrels that represent two separate species.Explain how the geographic barrier between these two populations led to the formation of two distinct species.

________ speciation can occur when populations of a species are separated by a physical barrier,thereby becoming geographically isolated and subsequently reproductively isolated from one another.

A rainforest is a highly complex habitat with organisms living at various levels in the trees,on the ground,and underground.Is it possible to consider two populations of insects living in the same tree to be geographically isolated?

Two species live in the same area but breed in different parts of their habitat.These species are

Choose two different reproductive barriers that lead to sympatric speciation and explain how they work.

Which of the following examples does NOT illustrate a difference in fitness that would lead to evolution by natural selection?

Explain how a change in the depth,either a lengthening or shortening,of flowers that contain nectar eaten by a particular species of hummingbird would potentially lead to a change in the hummingbird.

The two squirrel species shown in the figure arose from the same ancestor.The Kaibab squirrel lives on the north rim of the Grand Canyon and Abert's squirrel lives on the south rim.Which is the most likely explanation for their speciation?

Individual organisms with inherited characteristics that enable them to survive and reproduce are said to have greater ________ fitness than individuals who fail to survive and reproduce.

Adaptive evolution

The red-breasted nuthatch and the white-breasted nuthatch are similar in appearance and,in many regions of the United States,their ranges overlap.The two organisms do not interbreed.Based on this information,red-breasted and white-breasted nuthatches are

Although populations of North American apple maggot flies are not geographically isolated,they appear to be in the process of diverging into two new species.Which of the following could be causing speciation between two populations in the lack of geographic isolation?

Bacteria reproduce asexually,so scientists classify them based on

Convergent evolution involves unrelated,or distantly related,organisms developing similar traits.How is coevolution similar to convergent evolution?

Which of the following organisms would best be identified as a species using the biological species concept?

Sympatric speciation

Match each numbered statement to one of terms listed below. -process of evolution through natural selection

If two populations of beetles living in isolated areas are physically different but genetically similar,would they be considered one species or two? Explain your answer.

The Nature of Science

Chemistry of Life

Life Is Cellular

How Cells Work

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

What Genes Are

How Genes Work

Evidence for Evolution

Mechanisms of Evolution

The History of Life

Human Evolution

General Principles of Ecology

Growth of Populations

Communities of Organisms

Ecosystems

Applying the Science

Filters