Question 1

The original source of variation within a population comes from ________.

Accepted Answer

The answer of The original source of variation within a...

Question 2

At its most basic level,evolution is a:

Accepted Answer

A)  change in the frequency of alleles in a population.
B)  change in the frequency of alleles in an individual.
C)  new species arising from an existing species.
D)  change in an individual's phenotype caused by mutations.

Question 3

Extreme hunting pressure has caused northern elephant seals to become less genetically diverse because of:

Accepted Answer

A)  genetic drift.
B)  population bottleneck.
C)  natural selection.
D)  founder effect.

Question 4

Which of the following statements is true?

Accepted Answer

A)  The advantage a trait conveys depends on its environmental context.
B)  A population will always evolve to fit current conditions.
C)  All traits are simultaneously maximized in a population.
D)  All traits currently in a population must have provided a reproductive advantage at some point in time.

Question 5

Refer to the figure below, and then answer the question that follows.
 
-Human birth weights are an example of:

Accepted Answer

A)  disruptive selection.
B)  stabilizing selection.
C)  directional selection.
D)  sexual selection. B

Question 6

A small minority of mutations is adaptive,providing an improvement to the gene pool of the population.

Accepted Answer

A) True 
 B)False

Question 7

Refer to the figure below, and then answer the question that follows.
 
-The changes in cranial capacity over the course of human evolution are an example of:

Accepted Answer

A)  disruptive selection.
B)  stabilizing selection.
C)  directional selection.
D)  sexual selection.

Question 8

How successful an individual is at passing on its genes to the next generation is known as:

Accepted Answer

A)  microevolution.
B)  adaptation.
C)  fitness.
D)  sexual selection.

Question 9

Read the statement below, and then answer the following question(s) .
A small population of deer is introduced to an island. All the males have 11 to 13 points on their antlers.
-If after several generations all males have 12-point antlers,this development will have been due to:

Accepted Answer

A)  directional selection.
B)  disruptive selection.
C)  founder effect.
D)  stabilizing selection.

Question 10

The mate-attracting elaborate plumage of the male peacock is a result of:

Accepted Answer

A)  genetic drift.
B)  adaptation to the environment.
C)  sexual selection.
D)  gene flow. C

Question 11

Phenotypes that show a wide range of almost continuous variation,such as height or skin color in humans,are probably:

Accepted Answer

A)  due to several sets of alleles working together.
B)  due to both alleles of one gene working together.
C)  acquired characteristics.
D)  dominant.

Question 12

The term "natural selection" is not interchangeable with the term "evolution" because:

Accepted Answer

A)  natural selection is just a theory, whereas evolution has been proven.
B)  a population may evolve in ways other than through natural selection.
C)  Darwin coined the term "natural selection," but not "evolution."
D)  natural selection does not always lead to evolution.

Question 13

Read the statement below, and then answer the following question(s) .
A small population of deer is introduced to an island. All the males have 11 to 13 points on their antlers.
-If after several generations most males have antlers with 20 points,this development will have been the result of:

Accepted Answer

A)  directional selection.
B)  disruptive selection.
C)  founder effect.
D)  bottleneck effect.

Question 14

Which of the following statements about evolution is true?

Accepted Answer

A)  Evolution involves maintaining a constant frequency of alleles in the gene pool.
B)  Populations evolve.
C)  Individuals evolve.
D)  Evolution can proceed to a limited extent without the occurrence of mutation.

Question 15

The formation of new species over many generations is an example of:

Accepted Answer

A)  microevolution.
B)  macroevolution.
C)  gene pools.
D)  allelic variants. B

Question 16

Disruptive selection operates whenever:

Accepted Answer

A)  a phenotype is more successful because it is rare.
B)  natural selection is disrupted by genetic drift.
C)  the extremes in a distribution of phenotypes are more fit than the average.
D)  only the largest individuals survive.

Question 17

A population is:

Accepted Answer

A)  a group of organisms that can successfully interbreed in nature but do not interbreed with other such groups.
B)  all the members of a species that live in a defined geographic region at the same time.
C)  all the different species that live in a defined geographic area at the same time.
D)  a group of different species that share common features.

Question 18

Two nearby populations in which there is some movement of individuals between the populations are an example of:

Accepted Answer

A)  disruptive selection.
B)  bottleneck effect.
C)  genetic drift.
D)  gene flow.

Question 19

If every sexually reproducing organism has only two alleles for each gene,how can there be a range of traits seen for a physical characteristic?

Accepted Answer

A)  One of the alleles in an organism is expressed at different levels, while the other is turned off.
B)  Sometimes one of the alleles works, and other times the other allele works.
C)  There can be more than two variations of a gene in a population.
D)  In a population there are only two variations of a gene, but they are blended differently during sexual reproduction.

Question 20

________ is necessary for a population to survive over successive generations in response to environmental changes.

Accepted Answer

A)  Adaptation
B)  Sexual selection
C)  Speciation
D)  Gene flow

Exam 17: The Means of Evolution: Microevolution

The original source of variation within a population comes from ________.

Correct AnswerverifiedShow Answer

At its most basic level,evolution is a:

Correct AnswerverifiedShow Answer

Extreme hunting pressure has caused northern elephant seals to become less genetically diverse because of:

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Refer to the figure below, and then answer the question that follows. -Human birth weights are an example of:

Correct AnswerverifiedB

A small minority of mutations is adaptive,providing an improvement to the gene pool of the population.

Correct AnswerverifiedShow Answer

Refer to the figure below, and then answer the question that follows. -The changes in cranial capacity over the course of human evolution are an example of:

Correct AnswerverifiedShow Answer

How successful an individual is at passing on its genes to the next generation is known as:

Correct AnswerverifiedShow Answer

Read the statement below, and then answer the following question(s) . A small population of deer is introduced to an island. All the males have 11 to 13 points on their antlers. -If after several generations all males have 12-point antlers,this development will have been due to:

Correct AnswerverifiedShow Answer

The mate-attracting elaborate plumage of the male peacock is a result of:

Correct AnswerverifiedC

Phenotypes that show a wide range of almost continuous variation,such as height or skin color in humans,are probably:

Correct AnswerverifiedShow Answer

The term "natural selection" is not interchangeable with the term "evolution" because:

Correct AnswerverifiedShow Answer

Read the statement below, and then answer the following question(s) . A small population of deer is introduced to an island. All the males have 11 to 13 points on their antlers. -If after several generations most males have antlers with 20 points,this development will have been the result of:

Correct AnswerverifiedShow Answer

Which of the following statements about evolution is true?

Correct AnswerverifiedShow Answer

The formation of new species over many generations is an example of:

Correct AnswerverifiedB

Disruptive selection operates whenever:

Correct AnswerverifiedShow Answer

A population is:

Correct AnswerverifiedShow Answer

Two nearby populations in which there is some movement of individuals between the populations are an example of:

Correct AnswerverifiedShow Answer

If every sexually reproducing organism has only two alleles for each gene,how can there be a range of traits seen for a physical characteristic?

Correct AnswerverifiedShow Answer

________ is necessary for a population to survive over successive generations in response to environmental changes.

Correct AnswerverifiedShow Answer

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B

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C

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B

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