Question 1

Three species of tigers have become extinct due to overharvesting or habitat destruction.This is an example of

Accepted Answer

A)   mass extinction.
B)   background extinction rate.
C)   sympatric speciation.
D)   increased extinction rate by human activity.
E)   allopatric speciation.F) D) and E)
G) A) and B)

Question 2

Scientists have a complete fossil record showing the evolution of horses over millions of years.The fossil record indicates the legs becomes longer and the teeth larger,as ancestors of the modern horse adapted from living in forest to grasslands.This is an example of

Accepted Answer

A)   punctuated equilibrium.
B)   extinction.
C)   a postzygotic barrier to evolution.
D)   gradualism.
E)   a prezygotic barrier to evolution.F) A) and D)
G) A) and C)

Question 3

The rate of background extinctions per year per million species is

Accepted Answer

A)   0.1 to 1.0 species.
B)   0.001 to 0.01 species.
C)   1.0 to 10 species.
D)   10 to 100 species.
E)   No answer is correct.F) C) and D)
G) B) and C)

Question 4

A sterile mule is produced by mating a horse and a donkey.From this observation you could conclude

Accepted Answer

A)   that horses and donkeys are the same species.
B)   that horses and donkeys are different species.
C)   that mules are a result of macroevolution.
D)   that increasing the number of mules in a population will affect the allele frequency in the next generation.
E)   the DNA sequences of horses and donkeys are more than 97% identical.F) A) and B)
G) B) and E)

Question 5

Mules are a defined species because they produce fertile offspring when mated.

Accepted Answer

A) True 
 B)False

Question 6

If you observed that the sperm of a bull could not fuse in a lab dish with the eggs of a cow,you would say that the bull and the cow showed

Accepted Answer

A)   hybrid inviability.
B)   gametic isolation.
C)   temporal isolation.
D)   hybrid infertility.
E)   ecological isolation.F) A) and B)
G) C) and E)

Question 7

A horizontal branch in an evolutionary tree indicates

Accepted Answer

A)   gradualism.
B)   punctuated equilibrium.
C)   extinction.
D)   convergent evolution.
E)   temporal isolation.F) D) and E)
G) B) and D)

Question 8

Some flowers bloom in the spring while others bloom in the summer.This is an example of ________ reproductive isolation.

Accepted Answer

A)   postzygotic
B)   allopatric
C)   sympatric
D)   outgroup
E)   prezygoticF) B) and D)
G) B) and C)

Question 9

Humans are placed into what kingdom and domain?

Accepted Answer

A)   Animalia, Archaea
B)   Chordata, Archaea
C)   Archaea, Eukarya
D)   Animalia, Eukarya
E)   Archaea, AnimaliaF) All of the above
G) C) and E)

Question 10

Which of the following is not an example of microevolution?

Accepted Answer

A)   bacteria becoming resistant to antibiotics
B)   HIV evolving from chimpanzees
C)   insects becoming resistant to pesticides
D)   staph infections not responding to medicines
E)   All of the answer choices are examples of microevolution.F) D) and E)
G) None of the above

Question 11

Bacteria are not defined as species when applying the biological species concept.

Accepted Answer

A) True 
 B)False

Question 12

Conservation biologists are often concerned that when the population size of an endangered species becomes too small it is at risk of extinction.What is the basis of their concern?

Accepted Answer

A)   They can no longer evolve.
B)   Their rate of breeding will decline.
C)   They may be more susceptible to changes in the environment or disease.
D)   They are at risk of sympatric isolation.
E)   They are at risk of developing prezygotic barriers to reproduction.F) A) and E)
G) None of the above

Question 13

An evolutionary tree depicts species' relationships based on descent from shared ancestors.

Accepted Answer

A) True 
 B)False

Question 14

The idea that evolution proceeds with long periods of stasis with relatively brief bursts of fast evolutionary change is

Accepted Answer

A)   temporal isolation.
B)   mechanical isolation.
C)   gradualism.
D)   punctuated equilibrium.
E)   hybrid breakdown.F) B) and C)
G) A) and D)

Question 15

The more heritable traits organisms share,the more taxonomic levels they share.

Accepted Answer

A) True 
 B)False

Question 16

If a sheep and goat are bred,their offspring would die as an embryo.This is an example of ________ reproductive isolation.

Accepted Answer

A)   prezygotic
B)   allopatric
C)   sympatric
D)   postzygotic
E)   outgroupF) B) and C)
G) C) and E)

Question 17

If you saw two populations of a species of snail,separated by a water-filled valley that they could not cross,you might eventually expect to see speciation due to

Accepted Answer

A)   mechanical isolation.
B)   habitat isolation.
C)   hybrid inviability.
D)   behavioral isolation.
E)   temporal isolation.F) B) and E)
G) A) and C)

Question 18

Postzygotic isolation barriers prevent

Accepted Answer

A)   a hybrid embryo from developing into a fertile adult.
B)   fertilization.
C)   male gametes from joining with female gametes.
D)   formation of gametes by one of the parents.
E)   All answers are correct.F) A) and B)
G) All of the above

Question 19

The scientist given credit for devising the two-word naming system of all living organisms is

Accepted Answer

A)   Aristotle.
B)   Charles Darwin.
C)   Gregor Mendel.
D)   Carolus Linnaeus.
E)   Louis Pasteur.F) B) and C)
G) B) and E)

Question 20

Birds use specific songs,coloring,and mating dances to attract mates of their species.This is an example of ________ reproductive isolation.

Accepted Answer

A)   postzygotic
B)   allopatric
C)   prezygotic
D)   sympatric
E)   outgroupF) A) and B)
G) B) and E)

Exam 14: Speciation and Extinction

Which of the following is not an example of microevolution?

Correct AnswerverifiedShow Answer

A sterile mule is produced by mating a horse and a donkey.From this observation you could conclude

Correct AnswerverifiedShow Answer

An evolutionary tree depicts species' relationships based on descent from shared ancestors.

Correct AnswerverifiedShow Answer

Scientists have a complete fossil record showing the evolution of horses over millions of years.The fossil record indicates the legs becomes longer and the teeth larger,as ancestors of the modern horse adapted from living in forest to grasslands.This is an example of

Correct AnswerverifiedShow Answer

The idea that evolution proceeds with long periods of stasis with relatively brief bursts of fast evolutionary change is

Correct AnswerverifiedShow Answer

Some flowers bloom in the spring while others bloom in the summer.This is an example of ________ reproductive isolation.

Correct AnswerverifiedShow Answer

The scientist given credit for devising the two-word naming system of all living organisms is

Correct AnswerverifiedShow Answer

Bacteria are not defined as species when applying the biological species concept.

Correct AnswerverifiedShow Answer

The more heritable traits organisms share,the more taxonomic levels they share.

Correct AnswerverifiedShow Answer

Conservation biologists are often concerned that when the population size of an endangered species becomes too small it is at risk of extinction.What is the basis of their concern?

Correct AnswerverifiedShow Answer

The rate of background extinctions per year per million species is

Correct AnswerverifiedShow Answer

Postzygotic isolation barriers prevent

Correct AnswerverifiedShow Answer

A horizontal branch in an evolutionary tree indicates

Correct AnswerverifiedShow Answer

If you observed that the sperm of a bull could not fuse in a lab dish with the eggs of a cow,you would say that the bull and the cow showed

Correct AnswerverifiedShow Answer

Birds use specific songs,coloring,and mating dances to attract mates of their species.This is an example of ________ reproductive isolation.

Correct AnswerverifiedShow Answer

Humans are placed into what kingdom and domain?

Correct AnswerverifiedShow Answer

Three species of tigers have become extinct due to overharvesting or habitat destruction.This is an example of

Correct AnswerverifiedShow Answer

If you saw two populations of a species of snail,separated by a water-filled valley that they could not cross,you might eventually expect to see speciation due to

Correct AnswerverifiedShow Answer

If a sheep and goat are bred,their offspring would die as an embryo.This is an example of ________ reproductive isolation.

Correct AnswerverifiedShow Answer

Mules are a defined species because they produce fertile offspring when mated.

Correct AnswerverifiedShow Answer

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