Question 1

If two species are able to mate and produce an offspring which can mate with itself,but is unable to mate with either parent's species,it is an example of

Accepted Answer

A) allopatric speciation. 
B) sympatric speciation via disruptive selection. 
C) sympatric speciation via polyploidy. 
D) a species cluster. 
E) character displacement. 
A) allopatric speciation. 
B) sympatric speciation via disruptive selection. 
C) sympatric speciation via polyploidy. 
D) a species cluster. 
E) character displacement.

Question 2

In 1938,scientists found a population of coelacanths in the Indian Ocean.This fish species is considered a "living fossil" and appears not to have changed morphologically for 80 million years.This discovery supports the ________ model of evolution.

Accepted Answer

A) gradualism 
B) punctuated equilibrium 
C) adaptation 
D) natural selection 
E) common descent 
A) gradualism 
B) punctuated equilibrium 
C) adaptation 
D) natural selection 
E) common descent

Question 3

Prezygotic mechanisms lead to reproductive isolation by preventing the formation of

Accepted Answer

A) mating pairs. 
B) fertile eggs. 
C) fertile sperm or pollen cells. 
D) somatic cells. 
E) hybrid zygotes. 
A) mating pairs. 
B) fertile eggs. 
C) fertile sperm or pollen cells. 
D) somatic cells. 
E) hybrid zygotes.

Question 4

A type of isolating mechanism that leads to reproductive isolation after a hybrid zygote has formed is called a ________ isolating mechanism.

Accepted Answer

A) hybridization 
B) postzygotic 
C) prezygotic 
D) adaptive 
E) differential 
A) hybridization 
B) postzygotic 
C) prezygotic 
D) adaptive 
E) differential

Question 5

Lake Victoria is famous for its variety of cichlid fishes.In fact,they offer the most diverse assembly of vertebrates presently known to science.One trait that scientists have focused on as one possible reason for their adaptability is

Accepted Answer

A) a second set of scales that lie beneath the top outermost scales. 
B) a second set of jaws in their throats. 
C) gill arches that are not covered by an operculum,which prevents hiding places for gill parasites. 
D) digestive tracts that are able to process most substrates,which has eliminated the need for feeding specialization. 
E) ability to change color in relationship to their environment. 
A) a second set of scales that lie beneath the top outermost scales. 
B) a second set of jaws in their throats. 
C) gill arches that are not covered by an operculum,which prevents hiding places for gill parasites. 
D) digestive tracts that are able to process most substrates,which has eliminated the need for feeding specialization. 
E) ability to change color in relationship to their environment.

Question 6

Which form of speciation is most rapid?

Accepted Answer

A) allopatric speciation on the mainland 
B) allopatric speciation on island archipelagos 
C) sympatric speciation via polyploidy 
D) sympatric speciation via disruptive selection 
E) sympatric speciation via character displacement 
A) allopatric speciation on the mainland 
B) allopatric speciation on island archipelagos 
C) sympatric speciation via polyploidy 
D) sympatric speciation via disruptive selection 
E) sympatric speciation via character displacement

Question 7

Many species might coexist in a particular environment by occupying different ecological

Accepted Answer

A) biomes. 
B) niches. 
C) territories. 
D) domains. 
E) ranges. 
A) biomes. 
B) niches. 
C) territories. 
D) domains. 
E) ranges.

Exam 22: The Origin of Species

If two species are able to mate and produce an offspring which can mate with itself,but is unable to mate with either parent's species,it is an example of

In 1938,scientists found a population of coelacanths in the Indian Ocean.This fish species is considered a "living fossil" and appears not to have changed morphologically for 80 million years.This discovery supports the ________ model of evolution.

Prezygotic mechanisms lead to reproductive isolation by preventing the formation of

A type of isolating mechanism that leads to reproductive isolation after a hybrid zygote has formed is called a ________ isolating mechanism.

Lake Victoria is famous for its variety of cichlid fishes.In fact,they offer the most diverse assembly of vertebrates presently known to science.One trait that scientists have focused on as one possible reason for their adaptability is

Which form of speciation is most rapid?

Many species might coexist in a particular environment by occupying different ecological

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