Question 1

Allele frequency refers to the rate of mutation in a population.

Accepted Answer

A) True 
 B)False

Question 2

Recombination usually reverses the effects of a mutation.

Accepted Answer

A) True 
 B)False

Question 3

"Emigration" is the term that describes one or more individuals leaving their home population. Is the effect of emigration likely to have a greater genetic effect if the home population was large, or if the home population was small?

Accepted Answer

A)   large, because this is an example of disruptive selection
B)   large, because natural selection will cause a bottleneck to occur in the remaining individuals
C)   small, because the loss of just a few individuals may greatly reduce the remaining genetic variation
D)   small, because the remaining individuals will no longer be able to practice nonrandom mating

Question 4

In many cases of ____________ selection, mates are chosen based on physical features or behaviors rather than fitness.

Accepted Answer

The answer of In many cases of ____________ selection, mates...

Question 5

Which of the following is an example of gene flow?

Accepted Answer

A)   Pollen from a population A plant lands on the same plant (mating with itself) .
B)   Pollen from a population A plant lands on another population A plant.
C)   Pollen from a population A plant lands on a population B plant.
D)   Pollen from a population B plant lands on a population B plant.

Question 6

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

Question 7

_______ are the original source of genetic variation within a population.

Accepted Answer

The answer of _______ are the original source of genetic...

Question 8

Disruptive selection operates whenever

Accepted Answer

A)   natural selection is disrupted by genetic drift.
B)   there is a balanced gene pool.
C)   only the smallest individuals survive.
D)   the extremes in a distribution of phenotypes survive better than the average of a distribution.

Question 9

In fish undergoing sexual selection, females are more likely to mate with males lacking coloration because brightly colored males are more visible to predators.

Accepted Answer

A) True 
 B)False

Question 10

While on a camping trip, you collect some white tadpoles from a pond and take them home. The tadpoles develop into white bullfrogs. When the frogs get too big, you release them into a local pond. The next year, several white bullfrogs are observed in the pond. This is an example of

Accepted Answer

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

Question 11

The occurrence of mutation is directed toward a specific goal.

Accepted Answer

A) True 
 B)False

Question 12

Examine the graph below.
  
The shape of this graph indicates that birth weight in human babies is an example of _____________ selection.

Accepted Answer

The answer of Examine the graph below.
  
The shape...

Question 13

If a given population has 30 RR individuals, 10 Rr individuals, and 10 rr individuals, what is the genotype frequency of Rr?

Accepted Answer

A)   0.10
B)   0.20
C)   0.30
D)   0.50

Question 14

If p is the frequency of the W allele in a population, why do we equate the WW individuals with the p² portion of the Hardy-Weinberg equation?

Accepted Answer

A)   The Hardy-Weinberg equation describes the frequencies of dominant alleles only.
B)   The WW individuals have two copies of the allele represented by p.
C)   The ww individuals are all killed by lethal recessive genes.
D)   The frequency of p is always equal to the frequency of q.

Question 15

Genetic drift causes random changes in _______ frequency.

Accepted Answer

The answer of Genetic drift causes random changes in _______...

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

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

Accepted Answer

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

Question 18

What is genetic drift?

Accepted Answer

A)   gene mutation within, or between, populations
B)   chance evolutionary change occurring in small populations
C)   natural selection acting on large populations
D)   shifts in allelic frequencies due to mutation

Question 19

Does sexual reproduction alone necessarily cause evolution?

Accepted Answer

A)   Yes, sexual reproduction causes genetic drift.
B)   Yes, sexual reproduction is the only source of new heritable mutations.
C)   No, sexual reproduction creates variation, but evolution may or may not act on that variation.
D)   No, sexual reproduction produces new combinations of alleles that are never subject to natural selection.

Question 20

Two populations of geese live near each other. As time passes, the populations are becoming more genetically alike. This is probably due to gene _______.

Accepted Answer

The answer of Two populations of geese live near each...

Exam 17: Evolution of Populations

Examine the graph below. The shape of this graph indicates that birth weight in human babies is an example of _____________ selection.

Correct AnswerverifiedShow Answer

If a given population has 30 RR individuals, 10 Rr individuals, and 10 rr individuals, what is the genotype frequency of Rr?

Correct AnswerverifiedShow Answer

If p is the frequency of the W allele in a population, why do we equate the WW individuals with the p² portion of the Hardy-Weinberg equation?

Correct AnswerverifiedShow Answer

Two populations of geese live near each other. As time passes, the populations are becoming more genetically alike. This is probably due to gene _______.

Correct AnswerverifiedShow Answer

Which of the following statements concerning evolution is false?

Correct AnswerverifiedShow Answer

"Emigration" is the term that describes one or more individuals leaving their home population. Is the effect of emigration likely to have a greater genetic effect if the home population was large, or if the home population was small?

Correct AnswerverifiedShow Answer

What is genetic drift?

Correct AnswerverifiedShow Answer

Does sexual reproduction alone necessarily cause evolution?

Correct AnswerverifiedShow Answer

The occurrence of mutation is directed toward a specific goal.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In fish undergoing sexual selection, females are more likely to mate with males lacking coloration because brightly colored males are more visible to predators.

Correct AnswerverifiedShow Answer

Genetic drift causes random changes in _______ frequency.

Correct AnswerverifiedShow Answer

_______ are the original source of genetic variation within a population.

Correct AnswerverifiedShow Answer

While on a camping trip, you collect some white tadpoles from a pond and take them home. The tadpoles develop into white bullfrogs. When the frogs get too big, you release them into a local pond. The next year, several white bullfrogs are observed in the pond. This is an example of

Correct AnswerverifiedShow Answer

Which of the following is an example of gene flow?

Correct AnswerverifiedShow Answer

Recombination usually reverses the effects of a mutation.

Correct AnswerverifiedShow Answer

Allele frequency refers to the rate of mutation in a population.

Correct AnswerverifiedShow Answer

In many cases of ____________ selection, mates are chosen based on physical features or behaviors rather than fitness.

Correct AnswerverifiedShow Answer

Disruptive selection operates whenever

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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