Question 1

A gene has two alleles, D and d. The frequency of the D allele is 0.2. What is the frequency of the d allele?

Accepted Answer

A)  0.2
B)  0.4
C)  0.64
D)  0.8

Question 2

A student with Strep throat (caused by a strain of bacterium)  is given a prescription for an antibiotic and is told to take the drug for two weeks. After a week, the student feels better and stops taking the drug. Two months later, the student again shows symptoms of Strep throat and decides to finish the leftover antibiotic rather than going to the doctor again. Two months later, the student develops Strep throat for a third time and returns to the doctor. This time, the antibiotic does not work. The doctor runs a test and discovers that the bacterial strain the student is carrying is antibiotic resistant. What most likely happened?

Accepted Answer

A)  Because the use of antibiotics lowers the effectiveness of the immune system, the student continually reinfected himself with the bacteria. The third time, the student happened to be reinfected with a resistant strain.
B)  When the student stopped taking the drug, a small number of bacteria-those that were more drug resistant-still survived in his body. Those bacteria repopulated his throat and over time, drug-resistant alleles became more common.
C)  The student must have eaten produce that had been genetically engineered with antibiotic-resistant genes. When he consumed them, the bacteria in the student's throat picked up these genes through horizontal gene transfer.
D)  The antibiotic caused mutations in the bacterium. The more exposure to the antibiotic, the more mutations.

Question 3

Several related bird species live in a desert. One species is much smaller than the other species. This species nests in holes in cacti. Because the bird is so small, it can easily squeeze between the spines of the cactus and create a well-protected nest. This is an example of

Accepted Answer

A)  genetic drift.
B)  mutation.
C)  natural selection.
D)  gene flow. C

Question 4

For a population to evolve, there must be genetic differences between organisms in that population. These differences arise by

Accepted Answer

A)  mutation.
B)  a change in an organism's behavior.
C)  natural selection.
D)  common descent.

Question 5

Which of the following is true with regard to mutations?

Accepted Answer

A)  Mutations occur in response to environmental pressures.
B)  Mutations are more common in slowly growing organisms.
C)  Mutations appear without regard to environmental pressures.
D)  Several mutations must occur at one time for a new phenotype to appear.

Question 6

What is the total number of alleles present for any given gene in a population of 100 individuals?

Accepted Answer

A)  50
B)  100
C)  200
D)  400

Question 7

Genetic variation is based on

Accepted Answer

A)  the inheritance of alleles accumulated during the lifetime of an individual.
B)  differences in genotypes between the individuals in a population.
C)  the accumulation of mutations in somatic cells (as opposed to gametes) .
D)  the formation of new combinations of alleles during asexual reproduction.

Question 8

Evaluate the accuracy of the following statement: Individuals evolve by becoming more adapted to their environment. Explain how you reached your conclusion.

Accepted Answer

This statement is false because individu...

Question 9

Match each example to one of the processes below.
-A tourist carries seeds to a new location. These seeds are able to breed with plants of the same species in this new location.

Accepted Answer

A)  genetic drift
B)  genetic bottleneck
C)  founder effect
D)  gene flow
E)  natural selection

Question 10

Which of the following is NOT a mode of natural selection?

Accepted Answer

A)  directional selection
B)  disruptive selection
C)  dormant selection
D)  stabilizing selection C

Question 11

Gene flow occurs

Accepted Answer

A)  as a result of genetic drift.
B)  when an individual migrates between two otherwise isolated populations of a species.
C)  as a result of mutations in one population but not in another.
D)  when individuals within a population interbreed.

Question 12

Two unrelated species evolving to look more similar due to environmental pressures is called

Accepted Answer

A)  gene flow.
B)  genetic drift.
C)  convergent evolution.
D)  divergent evolution.

Question 13

New alleles arise by

Accepted Answer

A)  nonrandom mating.
B)  allele frequency.
C)  genetic drift.
D)  mutation.

Question 14

A population of 8,250 mice occupies the sand dunes in a coastal area. A severe hurricane washes out several miles of sand dunes. As a result, only 50 mice remain. The population has experienced

Accepted Answer

A)  horizontal gene transfer.
B)  gene flow.
C)  founder effect.
D)  a bottleneck.

Question 15

Compare and contrast bottleneck and founder effect.

Accepted Answer

Both of these processes are examples of ...

Question 16

Which of the following statements concerning evolution is FALSE?

Accepted Answer

A)  Natural selection requires variation in the population.
B)  An individual that is better adapted than others in a population will always be more reproductively successful.
C)  Genetic drift causes little evolutionary change in large populations.
D)  Evolution involves a change of frequency of alleles in the gene pool.

Question 17

Match each example to one of the processes below.
-Overfishing results in an endangered fish population with a very small population size.

Accepted Answer

A)  genetic drift
B)  genetic bottleneck
C)  founder effect
D)  gene flow
E)  natural selection

Question 18

Although millions of prairie chickens once occupied Illinois, in 1993 only 50 remained. Starting in 1992, scientists moved almost 300 prairie chickens from large populations in other states to Illinois to ________ Illinois prairie chicken populations.

Accepted Answer

A)  prevent the development of nonheritable mutations in
B)  introduce genetic variation back into
C)  induce stabilizing selection in
D)  cause genetic drift in

Question 19

A scientist is studying beak length in a species of hummingbird. The scientist establishes a population of birds with beaks ranging from very small to very long and allows the population to breed for 10 years. At the end of the experiment, she finds that the majority of birds in the population have very long beaks. This is an example of the ________ selection pattern of natural selection.

Accepted Answer

The answer of A scientist is studying beak length in...

Question 20

During gene flow,

Accepted Answer

A)  chance events alter the gene pool of a population.
B)  new individuals contribute their alleles to the gene pool of a population.
C)  alleles that make an individual more successful move from one population to another.
D)  crossing-over creates new combinations of alleles during gamete formation. B

Exam 11: Mechanisms of Evolution

A gene has two alleles, D and d. The frequency of the D allele is 0.2. What is the frequency of the d allele?

Correct Answer
verified

Correct Answer
verified

Several related bird species live in a desert. One species is much smaller than the other species. This species nests in holes in cacti. Because the bird is so small, it can easily squeeze between the spines of the cactus and create a well-protected nest. This is an example of

Correct Answer
verified
C

For a population to evolve, there must be genetic differences between organisms in that population. These differences arise by

Correct Answer
verified

Which of the following is true with regard to mutations?

Correct Answer
verified

What is the total number of alleles present for any given gene in a population of 100 individuals?

Correct Answer
verified

Genetic variation is based on

Correct Answer
verified

Evaluate the accuracy of the following statement: Individuals evolve by becoming more adapted to their environment. Explain how you reached your conclusion.

Correct Answer
verified
This statement is false because individu...
View Answer

Match each example to one of the processes below. -A tourist carries seeds to a new location. These seeds are able to breed with plants of the same species in this new location.

Correct Answer
verified

Which of the following is NOT a mode of natural selection?

Correct Answer
verified
C

Gene flow occurs

Correct Answer
verified

Two unrelated species evolving to look more similar due to environmental pressures is called

Correct Answer
verified

New alleles arise by

Correct Answer
verified

A population of 8,250 mice occupies the sand dunes in a coastal area. A severe hurricane washes out several miles of sand dunes. As a result, only 50 mice remain. The population has experienced

Correct Answer
verified

Compare and contrast bottleneck and founder effect.

Correct Answer
verified
Both of these processes are examples of ...
View Answer

Which of the following statements concerning evolution is FALSE?

Correct Answer
verified

Match each example to one of the processes below. -Overfishing results in an endangered fish population with a very small population size.

Correct Answer
verified

Although millions of prairie chickens once occupied Illinois, in 1993 only 50 remained. Starting in 1992, scientists moved almost 300 prairie chickens from large populations in other states to Illinois to ________ Illinois prairie chicken populations.

Correct Answer
verified

Correct Answer
verified

During gene flow,

Correct Answer
verified
B

Exam 11: Mechanisms of Evolution

A gene has two alleles, D and d. The frequency of the D allele is 0.2. What is the frequency of the d allele?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Several related bird species live in a desert. One species is much smaller than the other species. This species nests in holes in cacti. Because the bird is so small, it can easily squeeze between the spines of the cactus and create a well-protected nest. This is an example of

Correct AnswerverifiedC

For a population to evolve, there must be genetic differences between organisms in that population. These differences arise by

Correct AnswerverifiedShow Answer

Which of the following is true with regard to mutations?

Correct AnswerverifiedShow Answer

What is the total number of alleles present for any given gene in a population of 100 individuals?

Correct AnswerverifiedShow Answer

Genetic variation is based on

Correct AnswerverifiedShow Answer

Evaluate the accuracy of the following statement: Individuals evolve by becoming more adapted to their environment. Explain how you reached your conclusion.

Correct AnswerverifiedThis statement is false because individu...View AnswerShow Answer

Match each example to one of the processes below. -A tourist carries seeds to a new location. These seeds are able to breed with plants of the same species in this new location.

Correct AnswerverifiedShow Answer

Which of the following is NOT a mode of natural selection?

Correct AnswerverifiedC

Gene flow occurs

Correct AnswerverifiedShow Answer

Two unrelated species evolving to look more similar due to environmental pressures is called

Correct AnswerverifiedShow Answer

New alleles arise by

Correct AnswerverifiedShow Answer

A population of 8,250 mice occupies the sand dunes in a coastal area. A severe hurricane washes out several miles of sand dunes. As a result, only 50 mice remain. The population has experienced

Correct AnswerverifiedShow Answer

Compare and contrast bottleneck and founder effect.

Correct AnswerverifiedBoth of these processes are examples of ...View AnswerShow Answer

Which of the following statements concerning evolution is FALSE?

Correct AnswerverifiedShow Answer

Match each example to one of the processes below. -Overfishing results in an endangered fish population with a very small population size.

Correct AnswerverifiedShow Answer

Although millions of prairie chickens once occupied Illinois, in 1993 only 50 remained. Starting in 1992, scientists moved almost 300 prairie chickens from large populations in other states to Illinois to ________ Illinois prairie chicken populations.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

During gene flow,

Correct AnswerverifiedB

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C

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This statement is false because individu...
View Answer

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C

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Both of these processes are examples of ...
View Answer

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B