Question 1

Geographic isolation can result in speciation but usually only over long periods of time.

Accepted Answer

A) True 
 B)False

Question 2

Sympatric speciation requires geographic isolation of populations.

Accepted Answer

A) True 
 B)False

Question 3

Sympatric speciation can occur in the absence of geographic isolation.

Accepted Answer

A) True 
 B)False

Question 4

A desert plant in North America and one in Africa both have similar spines that they did not inherit from a common ancestor.The spines are ________ to each other.

Accepted Answer

The answer of A desert plant in North America and...

Question 5

Mass extinctions frequently result in adaptive radiation because they lead to

Accepted Answer

A)  allopatric speciation. 
B)  postzygotic barriers in other species. 
C)  mechanical isolation in other species. 
D)  ecological isolation in other species. 
A)  allopatric speciation. 
B)  postzygotic barriers in other species. 
C)  mechanical isolation in other species. 
D)  ecological isolation in other species.

Question 6

The distance needed for geographic isolation is

Accepted Answer

A)  larger for a crow than it is for a snail. 
B)  smaller for a crow than it is for a snail. 
C)  the same for both a crow and a snail. 
D)  impossible to determine because bird species cannot be geographically isolated. 
A)  larger for a crow than it is for a snail. 
B)  smaller for a crow than it is for a snail. 
C)  the same for both a crow and a snail. 
D)  impossible to determine because bird species cannot be geographically isolated.

Question 7

Individuals of the same species generally

Accepted Answer

A)  experience prezygotic barriers to reproduction. 
B)  do not interbreed extensively. 
C)  share many common physical and behavioral characteristics. 
D)  vary only very slightly in appearance. 
A)  experience prezygotic barriers to reproduction. 
B)  do not interbreed extensively. 
C)  share many common physical and behavioral characteristics. 
D)  vary only very slightly in appearance.

Question 8

For two populations to accumulate enough genetic differences to cause speciation,the factors that promote these differences

Accepted Answer

A)  must operate in populations that are not physically separated. 
B)  must have a greater effect than does the amount of ongoing gene flow. 
C)  must prevent mutations. 
D)  should include polyploidy. 
A)  must operate in populations that are not physically separated. 
B)  must have a greater effect than does the amount of ongoing gene flow. 
C)  must prevent mutations. 
D)  should include polyploidy.

Question 9

Today's diversity of mammals originated with an adaptive radiation that occurred 65 million years ago.This adaptive radiation occurred because

Accepted Answer

A)  ecological niches were opened up and predators were removed. 
B)  the evolution of a novel trait that gave the animals an advantage. 
C)  the ancestral species colonized a new continent. 
D)  increased competition led to rapid natural selection. 
A)  ecological niches were opened up and predators were removed. 
B)  the evolution of a novel trait that gave the animals an advantage. 
C)  the ancestral species colonized a new continent. 
D)  increased competition led to rapid natural selection.

Question 10

Organisms with homologous traits

Accepted Answer

A)  have undergone convergent evolution. 
B)  evolved the traits independently of each other. 
C)  are not related. 
D)  have speciated from a common ancestor. 
A)  have undergone convergent evolution. 
B)  evolved the traits independently of each other. 
C)  are not related. 
D)  have speciated from a common ancestor.

Question 11

Which of the following is NOT an example of a prezygotic barrier?

Accepted Answer

A)  Two populations of plants produce flowers at different times of year. 
B)  The reproductive organ of the male of one species of damselfly is physically unable to deposit sperm in the reproductive receptacle of the female of another species of damselfly. 
C)  The hybrid produced by the mating of a lion and a tiger is reproductively sterile. 
D)  One population of frogs lives in the middle of a pond and the other lives exclusively on land. 
A)  Two populations of plants produce flowers at different times of year. 
B)  The reproductive organ of the male of one species of damselfly is physically unable to deposit sperm in the reproductive receptacle of the female of another species of damselfly. 
C)  The hybrid produced by the mating of a lion and a tiger is reproductively sterile. 
D)  One population of frogs lives in the middle of a pond and the other lives exclusively on land.

Question 12

Which of the following is an example of a prezygotic barrier that can isolate two species living in the same geographic area?

Accepted Answer

A)  The members of two populations of birds living in neighboring forests freely interbreed. 
B)  One species of cichlid has the same mating behavior as another cichlid species in the same lake. 
C)  The gametes of one species of orchid in a rainforest are unable to fuse with the gametes of another species of orchid in the same rainforest. 
D)  Two species of wildflowers mate and produce a hybrid that is capable of successfully breeding with either species. 
A)  The members of two populations of birds living in neighboring forests freely interbreed. 
B)  One species of cichlid has the same mating behavior as another cichlid species in the same lake. 
C)  The gametes of one species of orchid in a rainforest are unable to fuse with the gametes of another species of orchid in the same rainforest. 
D)  Two species of wildflowers mate and produce a hybrid that is capable of successfully breeding with either species.

Question 13

The only modern humans that exhibit Neanderthal genes are descended from non-African ancestors.This is because

Accepted Answer

A)  hybrids produced by interbreeding between Neanderthals and African humans were not fertile. 
B)  the ancestors of African humans have the same ancestors as Neanderthals. 
C)  Neanderthals evolved outside of Africa,so only humans who lived outside of Africa could have interbred with them. 
D)  African humans evolved after Neanderthals went extinct. 
A)  hybrids produced by interbreeding between Neanderthals and African humans were not fertile. 
B)  the ancestors of African humans have the same ancestors as Neanderthals. 
C)  Neanderthals evolved outside of Africa,so only humans who lived outside of Africa could have interbred with them. 
D)  African humans evolved after Neanderthals went extinct.

Question 14

Sympatric speciation always follows allopatric speciation.

Accepted Answer

A) True 
 B)False

Question 15

Adaptive radiation gives rise to

Accepted Answer

A)  many descendent species. 
B)  many ancestral species. 
C)  a single descendent species. 
D)  many hybrid species. 
A)  many descendent species. 
B)  many ancestral species. 
C)  a single descendent species. 
D)  many hybrid species.

Question 16

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.

Question 17

Which of the following does NOT provide an example of geographic isolation?

Accepted Answer

A)  Two snail populations live in two valleys on opposite sides of a mountain range. 
B)  Two bird populations live on adjacent mountains with a narrow valley between them. 
C)  Two squirrel populations live on opposite sides of a wide,deep river. 
D)  Two fish populations live in different lakes. 
A)  Two snail populations live in two valleys on opposite sides of a mountain range. 
B)  Two bird populations live on adjacent mountains with a narrow valley between them. 
C)  Two squirrel populations live on opposite sides of a wide,deep river. 
D)  Two fish populations live in different lakes.

Question 18

The great diversity of life on Earth is caused by ________,the formation of new species.

Accepted Answer

The answer of The great diversity of life on Earth...

Question 19

Polyploidy can lead to very rapid speciation in plants because

Accepted Answer

A)  polyploidy increases the amount of gene flow between polyploid plants and nonpolyploid plants. 
B)  the DNA sequences of essential genes are altered to such a degree that the polyploid plant can no longer mate with the original species. 
C)  the gametes of polyploid plants have too many chromosomes and cannot fuse to the gametes of the original species. 
D)  when a plant becomes polyploid,it often loses the ability to make gametes of any type. 
A)  polyploidy increases the amount of gene flow between polyploid plants and nonpolyploid plants. 
B)  the DNA sequences of essential genes are altered to such a degree that the polyploid plant can no longer mate with the original species. 
C)  the gametes of polyploid plants have too many chromosomes and cannot fuse to the gametes of the original species. 
D)  when a plant becomes polyploid,it often loses the ability to make gametes of any type.

Question 20

Adaptive evolution allows species to

Accepted Answer

A)  reduce the mutation rate. 
B)  decrease genetic variation. 
C)  adjust to environmental changes. 
D)  hybridize. 
A)  reduce the mutation rate. 
B)  decrease genetic variation. 
C)  adjust to environmental changes. 
D)  hybridize.

Exam 15: The Origin of Species

Geographic isolation can result in speciation but usually only over long periods of time.

Sympatric speciation requires geographic isolation of populations.

Sympatric speciation can occur in the absence of geographic isolation.

A desert plant in North America and one in Africa both have similar spines that they did not inherit from a common ancestor.The spines are ________ to each other.

Mass extinctions frequently result in adaptive radiation because they lead to

The distance needed for geographic isolation is

Individuals of the same species generally

For two populations to accumulate enough genetic differences to cause speciation,the factors that promote these differences

Today's diversity of mammals originated with an adaptive radiation that occurred 65 million years ago.This adaptive radiation occurred because

Organisms with homologous traits

Which of the following is NOT an example of a prezygotic barrier?

Which of the following is an example of a prezygotic barrier that can isolate two species living in the same geographic area?

The only modern humans that exhibit Neanderthal genes are descended from non-African ancestors.This is because

Sympatric speciation always follows allopatric speciation.

Adaptive radiation gives rise to

Populations within a species are connected by

Which of the following does NOT provide an example of geographic isolation?

The great diversity of life on Earth is caused by ________,the formation of new species.

Polyploidy can lead to very rapid speciation in plants because

Adaptive evolution allows species to

The Nature of Science and the Characteristics of Life

The Chemistry of Life

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy, Metabolism, and Enzymes

Photosynthesis and Cellular Respiration

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From Gene to Protein

DNA Technology

How Evolution Works

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