Question 1

Which of the following is/are a biological "population?"

Accepted Answer

A)  all of the corn plants in a cornfield
B)  all of the variable-colored ladybird beetles of the species Harmonia axyridis in a forest
C)  all male and female English sparrows that reside in your community
D)  all of the human population of a rural western town
E)  All of the choices are correct.F) None of the above
G) C) and D)

Question 2

Which of the following examples will help maintain diversity within a population?

Accepted Answer

A)  Lack of mutations within the population.
B)  Random mating.
C)  Absence of migration.
D)  Natural selection. IncorrectE) A) and C)
F) All of the above

Question 3

Another student proposes that handedness could just as easily be passed to children by how the parents carry the child and interact with it,a learning process that may perpetuate from the parents' handedness.Assuming all parents and children are expressing their "true handedness," the occurrence of which case below would cast the most serious doubt on a simple genetic basis for handedness,with left-handedness recessive?

Accepted Answer

A)  Two right-handed parents have a left-handed child.
B)  Two left-handed parents have a right-handed child.
C)  Left-handed parents only have left-handed children.
D)  Right-handed parents only have right-handed children.
E)  None of the choices are correct.F) A) and C)
G) B) and D)

Question 4

Which of the following is required for natural selection to occur in a population?

Accepted Answer

A)  variation in the population
B)  inheritance of variation through genetic differences
C)  differential reproduction so that the more fit individuals have more offspring that survive to reproduce
D)  accumulation of adaptive traits so that they increase in the population
E)  All of the choices are required.F) C) and E)
G) None of the above

Question 5

Which of these conditions is NOT among the requirements of the Hardy-Weinberg equilibrium of allele frequencies in a population?

Accepted Answer

A)  small population with genetic drift
B)  no net migration of alleles into or out of the population
C)  no net mutations
D)  no selection of one genotype over another
E)  random mating populationF) None of the above
G) A) and D)

Question 6

Which of the following is true about genetic drift?

Accepted Answer

A)  It is more likely to occur in a large population than in a small population.
B)  It may lead to an allele's becoming fixed in a population when its alternative allele is lost from the population.
C)  It increases the number of heterozygotes in a population.
D)  It increases the frequency of rare alleles in a population.E) A) and D)
F) A) and C)

Question 7

Our domesticated honey bee-originally from Europe-is slow to sting,requires abundant flower nectar,gets up late in the morning,and stores much honey but only produces enough new brood to swarm once a year.Because the European honey bee was performing poorly as a honey producer in South America,the African subspecies was imported in a breeding experiment.The African honey bee formed small nests,foraged earlier and on smaller nectar sources,produced less honey stores and more brood,swarmed four or five times a year,and was fast to sting.However,when the African queens escaped,the two populations interbred and the African genotype spread several hundred miles north each year.Surprisingly,a hundred miles behind the expanding range of the African honey bees,the European and hybrid strains died out and the bees were essentially 100 percent African.How would this be explained in evolutionary genetics terms?

Accepted Answer

A)  Gene flow is not occurring and therefore these are two separate species.
B)  This is a natural consequence of the Hardy-Weinberg equilibrium.
C)  Obviously the African bee genes are dominant over the European honey bee alleles.
D)  Gene flow is occurring between these subspecies but the African bee is 'ecologically better suited".
E)  This can be understood as a classic case of genetic drift.F) C) and E)
G) A) and E)

Question 8

What is the term used to describe the changes in allele frequencies of a population over generations?

Accepted Answer

A)  genetic drift
B)  founder effect
C)  microevolution
D)  directional selectionE) All of the above
F) A) and D)

Question 9

While studying gull egg laying abilities a researcher noted that the birds laid an average of 7 - 9 eggs per clutch at the beginning of the study.After studying the population for 15 generations the researcher noted that the birds now laid an average of 3- 4 eggs per clutch.What type of natural selection is occurring in the population of gulls?

Accepted Answer

A)  stabilizing
B)  directional
C)  disruptive
D)  There is no selection occurring in this population. CorrectE) None of the above
F) All of the above

Question 10

If two adjacent populations of the same species show gene flow,then the two populations will

Accepted Answer

A)  become more similar in their gene pools.
B)  become isolated from each other.
C)  develop into different species.
D)  adapt to different conditions and become separate.E) All of the above
F) A) and B)

Question 11

A population of organisms that reproduce asexually without gametes from other individuals will display more variation than a population that reproduces sexually.

Accepted Answer

A) True 
 B)False

Question 12

What do the Founder Effect and the Bottleneck Effect have in common?

Accepted Answer

A)  Both the Founder Effect and the bottleneck effect result from mutation
B)  Both the Founder Effect and the bottleneck effect result from increase gene flow
C)  Both the Founder Effect and the bottleneck effect are examples of disruptive selection
D)  Both the Founder Effect and the bottleneck effect occur by chance.E) A) and D)
F) A) and C)

Question 13

Gene mutation occurs at any time,without respect to the mutation's adaptive value or benefit to the organism.

Accepted Answer

A) True 
 B)False

Question 14

The Hardy-Weinberg equilibrium is usually met in populations in changing environments.

Accepted Answer

A) True 
 B)False

Question 15

While we have seen how natural selection and the use of pesticides can lead to the development of resistant varieties of insects,two economically important flies,the Mediterranean fruit fly (Medfly) and the screwworm fly,can be driven to local extinction by the continuous release of sterile flies of those species.The critical factor is that the female of these species only mates once.But which of the following is/are also necessary for sterile release to work?

Accepted Answer

A)  The target species is truly just one species.
B)  The insect can be raised artificially in large numbers.
C)  The insects to be released can be sterilized with radiation without affecting their ability to attract a mate in the wild.
D)  All of the choices are correct.E) A) and B)
F) A) and C)

Question 16

Which statement is NOT true about the Founder Effect?

Accepted Answer

A)  It is a form of genetic drift.
B)  It produces a high frequency of some rare alleles in a small isolated population.
C)  Founding members contain a tiny fraction of the alleles found in the original population.
D)  The Founder Effect occurs when a population is subjected to near extinction and then recovers so that only a few alleles are left in survivors.E) All of the above
F) A) and B)

Question 17

Which of the following conditions is necessary to maintain the Hardy-Weinberg equilibrium?

Accepted Answer

A)  Random mating
B)  Mutations
C)  Sexual selection
D)  Gene flow
E)  Genetic drift CorrectF) A) and E)
G) C) and D)

Question 18

British land snails are an example of disruptive selection.In the grassy fields,the light-banded snails escape bird predators.In the darker forest,the dark snails survive and the light-banded snails are eaten.As long as the snails continue to cruise across the British landscape mating at the same season,why doesn't this "disruptive selection" eventually lead to two separate species?

Accepted Answer

A)  There is no reproductive isolation to prevent gene flow.
B)  They are already two separate species,and the intermediate forms are hybrids.
C)  The color forms are probably not genetically determined.
D)  There must be some unknown factor producing an equal stabilizing selection "to hold the species together."
E)  This will result in the formation of two species if given long enough time.F) A) and B)
G) C) and E)

Question 19

A certain species of butterfly varies in color from white to dark blue.The birds found in the same area feed on the white or lightly colored butterflies,leaving butterflies that are darkly colored.This may result in what type of selection?

Accepted Answer

A)  stabilizing selection
B)  disruptive selection
C)  directional selectionD) A) and B)
E) A) and C)

Question 20

In a population,the allele frequency for red flower color remained at 0.7 and the allele frequency for white flower remained at 0.3 for six generations.This ____ an example of a Hardy-Weinberg equilibrium in that ___________.

Accepted Answer

A)  is not,evolution occurred
B)  is,evolution did not occur
C)  is,evolution occurred
D)  is not,evolution did not occurE) None of the above
F) All of the above

Exam 16: How Populations Evolve

A population of organisms that reproduce asexually without gametes from other individuals will display more variation than a population that reproduces sexually.

Correct Answer
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Correct Answer
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What is the term used to describe the changes in allele frequencies of a population over generations?

Correct Answer
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Which of the following examples will help maintain diversity within a population?

Correct Answer
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If two adjacent populations of the same species show gene flow,then the two populations will

Correct Answer
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Correct Answer
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Which of the following is/are a biological "population?"

Correct Answer
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What do the Founder Effect and the Bottleneck Effect have in common?

Correct Answer
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The Hardy-Weinberg equilibrium is usually met in populations in changing environments.

Correct Answer
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Correct Answer
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Correct Answer
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Which statement is NOT true about the Founder Effect?

Correct Answer
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Gene mutation occurs at any time,without respect to the mutation's adaptive value or benefit to the organism.

Correct Answer
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A certain species of butterfly varies in color from white to dark blue.The birds found in the same area feed on the white or lightly colored butterflies,leaving butterflies that are darkly colored.This may result in what type of selection?

Correct Answer
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Correct Answer
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Which of the following is true about genetic drift?

Correct Answer
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Which of the following conditions is necessary to maintain the Hardy-Weinberg equilibrium?

Correct Answer
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Which of the following is required for natural selection to occur in a population?

Correct Answer
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In a population,the allele frequency for red flower color remained at 0.7 and the allele frequency for white flower remained at 0.3 for six generations.This an example of a Hardy-Weinberg equilibrium in that _______.

Correct Answer
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Which of these conditions is NOT among the requirements of the Hardy-Weinberg equilibrium of allele frequencies in a population?

Correct Answer
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Exam 16: How Populations Evolve

A population of organisms that reproduce asexually without gametes from other individuals will display more variation than a population that reproduces sexually.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the term used to describe the changes in allele frequencies of a population over generations?

Correct AnswerverifiedShow Answer

Which of the following examples will help maintain diversity within a population?

Correct AnswerverifiedShow Answer

If two adjacent populations of the same species show gene flow,then the two populations will

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following is/are a biological "population?"

Correct AnswerverifiedShow Answer

What do the Founder Effect and the Bottleneck Effect have in common?

Correct AnswerverifiedShow Answer

The Hardy-Weinberg equilibrium is usually met in populations in changing environments.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which statement is NOT true about the Founder Effect?

Correct AnswerverifiedShow Answer

Gene mutation occurs at any time,without respect to the mutation's adaptive value or benefit to the organism.

Correct AnswerverifiedShow Answer

A certain species of butterfly varies in color from white to dark blue.The birds found in the same area feed on the white or lightly colored butterflies,leaving butterflies that are darkly colored.This may result in what type of selection?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following is true about genetic drift?

Correct AnswerverifiedShow Answer

Which of the following conditions is necessary to maintain the Hardy-Weinberg equilibrium?

Correct AnswerverifiedShow Answer

Which of the following is required for natural selection to occur in a population?

Correct AnswerverifiedShow Answer

In a population,the allele frequency for red flower color remained at 0.7 and the allele frequency for white flower remained at 0.3 for six generations.This ____ an example of a Hardy-Weinberg equilibrium in that ___________.

Correct AnswerverifiedShow Answer

Which of these conditions is NOT among the requirements of the Hardy-Weinberg equilibrium of allele frequencies in a population?

Correct AnswerverifiedShow Answer

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In a population,the allele frequency for red flower color remained at 0.7 and the allele frequency for white flower remained at 0.3 for six generations.This an example of a Hardy-Weinberg equilibrium in that _______.

Correct Answer
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Correct Answer
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