Question 1

Allopatric speciation is not likely to occur when

Accepted Answer

A)   there is no disruption in gene flow between two populations.
B)   a geographic barrier forms between two populations.
C)   several populations become isolated from one another as drying conditions cause a large body of water to become separate, smaller bodies of water.
D)   separated populations adapt to different environmental conditions.E) C) and D)
F) A) and C)

Question 2

Which of the following would tend to promote adaptive radiation?

Accepted Answer

A)   An organism has a very stable set of features and capabilities over long spans of evolutionary time.
B)   An organism colonizes an isolated area that is habitable but relatively devoid of life.
C)   An organism colonizes an area that already has a high level of existing species diversity.
D)   A single species goes extinct, but it has several competitors that quickly expand to assume its ecological roles.E) A) and B)
F) B) and D)

Question 3

If H. floresiensis were reunited with H. erectus at a much later date but the two populations could no longer interbreed, it would be correct to conclude that

Accepted Answer

A)   H. floresiensis is no longer fertile as a species.
B)   the two groups had been isolated for more than 50,000 years.
C)   H. floresiensis has become less fit than H. erectus.
D)   a reproductive barrier had evolved.E) A) and D)
F) A) and B)

Question 4

Which of the following types of reproductive barriers separates a pair of species that could interbreed but for the fact that one mates at dusk and the other at dawn?

Accepted Answer

A)   temporal isolation
B)   habitat isolation
C)   behavioral isolation
D)   mechanical isolationE) None of the above
F) B) and D)

Question 5

Organisms that possess more than two complete sets of chromosomes are said to be

Accepted Answer

A)   haploid.
B)   polyploid.
C)   diploid.
D)   hybrids.E) A) and B)
F) A) and C) B

Question 6

A new plant species may arise in a single generation by

Accepted Answer

A)   errors in meiosis leading to polyploidy.
B)   a sudden geological disruption causing separation of two populations.
C)   mutations in genes for flower color.
D)   changes in the pollinator species.E) A) and D)
F) None of the above

Question 7

Diane Dodd's experiments using fruit flies demonstrated that

Accepted Answer

A)   the evolution of reproductive barriers occurs much too slowly to produce measurable effects in the laboratory.
B)   new species can form in a single generation by the production of new reproductive structures.
C)   formation of a reproductive barrier between two populations is more likely if they experience and adapt to different environmental conditions.
D)   reproductive barriers usually are absolute: Either two populations are fully willing and able to interbreed, or they are strictly separated by a fully effective reproductive barrier.E) A) and B)
F) A) and C)

Question 8

A group of ants escaped from a picnic basket carried to the top of a mountain and thrived in this area where there were no other ants. Many years later descendants of these ants crawled into a picnic basket on the mountain and traveled back to the valley from which their ancestors had come. Which of these observations would cause you to conclude that the ants on top of the mountain had become a different species from those in the valley?

Accepted Answer

A)   The mountain ants and valley ants were different colors.
B)   The mountain ants and valley ants were different sizes.
C)   The mountain ants ate different food than the valley ants.
D)   The mountain ants could not mate with the valley ants.E) All of the above
F) C) and D)

Question 9

One of the finest available sequences of fossils shows how horses have changed slowly and by subtle steps from small, shrub-browsing ancestors to the large, grass-grazing modern horse. A large number of fossil species have been named, and it is often difficult to decide on the identity of a fossil horse because transitional forms are common. This record of evolution best fits the idea of

Accepted Answer

A)   the gradual model of speciation.
B)   punctuated equilibrium.
C)   adaptive radiation.
D)   hybrid breakdown.E) B) and D)
F) A) and B)

Question 10

Under the biological species concept, a species is a group of organisms that

Accepted Answer

A)   are physically similar.
B)   share a recent common ancestor.
C)   live together in a location and carry out identical ecological roles.
D)   have the potential to interbreed in nature and produce fertile offspring.E) A) and B)
F) All of the above

Question 11

Which of the following types of reproductive barriers separates two flowering plant species that could interbreed but for the fact that one has a deep flower tube and is pollinated by bumblebees whereas the other has a short, narrow flower tube and is pollinated by honeybees?

Accepted Answer

A)   habitat isolation
B)   behavioral isolation
C)   mechanical isolation
D)   gametic isolationE) B) and C)
F) A) and D)

Question 12

Which butterfly has changed gradually but significantly from its ancestor through microevolutionary events that were not part of a speciation event?

Accepted Answer

A)   butterfly A
B)   butterfly B
C)   butterfly C
D)   butterfly DE) A) and D)
F) None of the above

Question 13

The Monterey pine and the Bishop's pine inhabit some of the same areas of central California. The Monterey pine releases pollen in February, while the Bishop's pine does so in April. This is an example of ________ isolation.

Accepted Answer

A)   postzygotic
B)   temporal
C)   habitat
D)   mechanicalE) A) and C)
F) None of the above

Question 14

Which of the following descriptions best represents the gradual model of speciation?

Accepted Answer

A)   Speciation occurs regularly as a result of the accumulation of many small changes.
B)   An isolated population differentiates quickly from its parent stock as it adapts to its local environment.
C)   Speciation occurs under unusual circumstances and therefore transitional fossils are hard to find.
D)   Species undergo little change over long periods interrupted only by short periods of rapid change.E) None of the above
F) C) and D)

Question 15

Two species that occasionally mate and produce zygotes, but that have incompatible genes that prevent the resulting embryo from developing, are affected by

Accepted Answer

A)   gametic isolation.
B)   reduced hybrid fertility.
C)   reduced hybrid viability.
D)   behavioral isolation.E) None of the above
F) A) and B) C

Question 16

When a tetraploid flower pollinates a diploid flower of the parental species, the resulting offspring will be

Accepted Answer

A)   pentaploid and sterile.
B)   diploid and fertile.
C)   triploid and fertile.
D)   triploid and sterile.E) A) and B)
F) A) and C)

Question 17

Which of the following would a biologist describe as microevolution?

Accepted Answer

A)   the formation of new species
B)   the extinction of species
C)   dramatic biological changes, such as the origin of flight, within a taxon
D)   a change in the gene pool of a population from one generation to the nextE) All of the above
F) A) and B)

Question 18

Uplift and formation of a mountain range divide a freshwater snail species into two isolated populations. Erosion eventually lowers the mountain range and brings the two populations together again, but when they mate, the resulting hybrids all produce sterile young. This scenario is an example of

Accepted Answer

A)   sympatric speciation.
B)   allopatric speciation.
C)   incomplete speciation.
D)   diversifying speciation.E) C) and D)
F) A) and B) B

Question 19

The data in this graph indicate

Accepted Answer

A)   there were fewer total tough seeds in 1976 than in 1977.
B)   plants that produced soft seeds in 1976 produced tougher seeds in 1977.
C)   available seeds were generally tougher in 1977 than in 1976.
D)   seed abundance in 1977 was severely reduced by finch feeding.E) B) and C)
F) C) and D)

Question 20

In the chiclid populations in Lake Victoria, what trait in females acted as a selection factor on which males they mated with?

Accepted Answer

A)   color vision
B)   body color
C)   preferred water depth
D)   ability to hear sounds made by the maleE) A) and B)
F) B) and D)

Exam 14: The Origin of Species

Allopatric speciation is not likely to occur when

Correct Answer
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Which of the following would tend to promote adaptive radiation?

Correct Answer
verified

If H. floresiensis were reunited with H. erectus at a much later date but the two populations could no longer interbreed, it would be correct to conclude that

Correct Answer
verified

Which of the following types of reproductive barriers separates a pair of species that could interbreed but for the fact that one mates at dusk and the other at dawn?

Correct Answer
verified

Organisms that possess more than two complete sets of chromosomes are said to be

Correct Answer
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B

A new plant species may arise in a single generation by

Correct Answer
verified

Diane Dodd's experiments using fruit flies demonstrated that

Correct Answer
verified

Correct Answer
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Correct Answer
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Under the biological species concept, a species is a group of organisms that

Correct Answer
verified

Which of the following types of reproductive barriers separates two flowering plant species that could interbreed but for the fact that one has a deep flower tube and is pollinated by bumblebees whereas the other has a short, narrow flower tube and is pollinated by honeybees?

Correct Answer
verified

Which butterfly has changed gradually but significantly from its ancestor through microevolutionary events that were not part of a speciation event?

Correct Answer
verified

The Monterey pine and the Bishop's pine inhabit some of the same areas of central California. The Monterey pine releases pollen in February, while the Bishop's pine does so in April. This is an example of ________ isolation.

Correct Answer
verified

Which of the following descriptions best represents the gradual model of speciation?

Correct Answer
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Two species that occasionally mate and produce zygotes, but that have incompatible genes that prevent the resulting embryo from developing, are affected by

Correct Answer
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C

When a tetraploid flower pollinates a diploid flower of the parental species, the resulting offspring will be

Correct Answer
verified

Which of the following would a biologist describe as microevolution?

Correct Answer
verified

Uplift and formation of a mountain range divide a freshwater snail species into two isolated populations. Erosion eventually lowers the mountain range and brings the two populations together again, but when they mate, the resulting hybrids all produce sterile young. This scenario is an example of

Correct Answer
verified
B

The data in this graph indicate

Correct Answer
verified

In the chiclid populations in Lake Victoria, what trait in females acted as a selection factor on which males they mated with?

Correct Answer
verified

Exam 14: The Origin of Species

Allopatric speciation is not likely to occur when

Correct AnswerverifiedShow Answer

Which of the following would tend to promote adaptive radiation?

Correct AnswerverifiedShow Answer

If H. floresiensis were reunited with H. erectus at a much later date but the two populations could no longer interbreed, it would be correct to conclude that

Correct AnswerverifiedShow Answer

Which of the following types of reproductive barriers separates a pair of species that could interbreed but for the fact that one mates at dusk and the other at dawn?

Correct AnswerverifiedShow Answer

Organisms that possess more than two complete sets of chromosomes are said to be

Correct AnswerverifiedB

A new plant species may arise in a single generation by

Correct AnswerverifiedShow Answer

Diane Dodd's experiments using fruit flies demonstrated that

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Under the biological species concept, a species is a group of organisms that

Correct AnswerverifiedShow Answer

Which of the following types of reproductive barriers separates two flowering plant species that could interbreed but for the fact that one has a deep flower tube and is pollinated by bumblebees whereas the other has a short, narrow flower tube and is pollinated by honeybees?

Correct AnswerverifiedShow Answer

Which butterfly has changed gradually but significantly from its ancestor through microevolutionary events that were not part of a speciation event?

Correct AnswerverifiedShow Answer

The Monterey pine and the Bishop's pine inhabit some of the same areas of central California. The Monterey pine releases pollen in February, while the Bishop's pine does so in April. This is an example of ________ isolation.

Correct AnswerverifiedShow Answer

Which of the following descriptions best represents the gradual model of speciation?

Correct AnswerverifiedShow Answer

Two species that occasionally mate and produce zygotes, but that have incompatible genes that prevent the resulting embryo from developing, are affected by

Correct AnswerverifiedC

When a tetraploid flower pollinates a diploid flower of the parental species, the resulting offspring will be

Correct AnswerverifiedShow Answer

Which of the following would a biologist describe as microevolution?

Correct AnswerverifiedShow Answer

Uplift and formation of a mountain range divide a freshwater snail species into two isolated populations. Erosion eventually lowers the mountain range and brings the two populations together again, but when they mate, the resulting hybrids all produce sterile young. This scenario is an example of

Correct AnswerverifiedB

The data in this graph indicate

Correct AnswerverifiedShow Answer

In the chiclid populations in Lake Victoria, what trait in females acted as a selection factor on which males they mated with?

Correct AnswerverifiedShow Answer

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B

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C

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B

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