Question 1

When a population goes through a bottleneck, genetic drift occurs in the large population of survivors of a severe change in environment. 
___________

Accepted Answer

A) True 
 B)False

Question 2

Frequency-dependent selection acts to decrease the frequency of which phenotype in a population?

Accepted Answer

A)  The least common phenotype 
B)  The most common phenotype 
C)  The most conspicuous phenotype 
D)  The most camouflaged phenotype 
E)  The phenotype at an extreme of the normal distribution 
A)  The least common phenotype 
B)  The most common phenotype 
C)  The most conspicuous phenotype 
D)  The most camouflaged phenotype 
E)  The phenotype at an extreme of the normal distribution

Question 3

A population of people who have lived in the middle of the jungle for thousands of years without coming in contact with other individuals would show evidence of:

Accepted Answer

A)  genetic stasis. 
B)  polymorphism. 
C)  random mating. 
D)  genetic equilibrium. 
E)  increasing non-harmful alleles. 
A)  genetic stasis. 
B)  polymorphism. 
C)  random mating. 
D)  genetic equilibrium. 
E)  increasing non-harmful alleles.

Question 4

The movement of 25-year-old fertile individuals between Mexico and Canada will eventually contribute to:

Accepted Answer

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

Question 5

The allele for sickle cell anemia is maintained in populations by frequency dependent selection . 
_______________

Accepted Answer

A) True 
 B)False

Question 6

What best describes all of the alleles for all the loci present in a population?

Accepted Answer

A)  gene pool 
B)  allele collection 
C)  population variation 
D)  evolutionary potential 
E)  population compilation 
A)  gene pool 
B)  allele collection 
C)  population variation 
D)  evolutionary potential 
E)  population compilation

Question 7

The Hardy-Weinberg principle is applicable provided that migration:

Accepted Answer

A)  does not occur. 
B)  is limited to adults. 
C)  is limited to juveniles. 
D)  only occurs during nonreproductive periods. 
E)  occurs at the beginning of the breeding season. 
A)  does not occur. 
B)  is limited to adults. 
C)  is limited to juveniles. 
D)  only occurs during nonreproductive periods. 
E)  occurs at the beginning of the breeding season.

Question 8

If individuals in the same town continue to only mate with other individuals from the same town, one would expect to see an increase in ____ within the population.

Accepted Answer

A)  genetic drift 
B)  migration 
C)  heterozygosity 
D)  homozygosity 
E)  assortative mating 
A)  genetic drift 
B)  migration 
C)  heterozygosity 
D)  homozygosity 
E)  assortative mating

Question 9

Variation that does not alter the ability of an individual to survive and reproduce is therefore considered:

Accepted Answer

A)  neutral 
B)  genetic 
C)  geographic 
D)  heterozygous 
E)  frequency-dependent 
A)  neutral 
B)  genetic 
C)  geographic 
D)  heterozygous 
E)  frequency-dependent

Question 10

If a population of 1000 individuals has 120 aa genotypes, 460 Aa genotypes, and 420 AA genotypes, what is the allele frequency of the dominant allele (A)?

Accepted Answer

A)  0.16 
B)  0.43 
C)  0.50 
D)  0.65 
E)  0.88 
A)  0.16 
B)  0.43 
C)  0.50 
D)  0.65 
E)  0.88

Question 11

If an animal population is diploid, then each individual possesses:

Accepted Answer

A)  one allele for each locus. 
B)  two alleles for each locus. 
C)  three or more alleles for each locus. 
D)  a partial set of alleles found in each cell. 
E)  a complete set of alleles found in each chromosome. 
A)  one allele for each locus. 
B)  two alleles for each locus. 
C)  three or more alleles for each locus. 
D)  a partial set of alleles found in each cell. 
E)  a complete set of alleles found in each chromosome.

Question 12

Bacterial populations have been exposed to an antibiotic and have developed resistance to the antibiotic over time. Would this be an example of stabilizing selection, directional selection, or disruptive selection? Explain your reasoning.

Accepted Answer

Concepts to Consider: This is

Question 13

A ____ consists of all of the individuals of the same species that inhabit a particular place at the same time.

Accepted Answer

A)  family 
B)  genotype 
C)  population 
D)  ecosystem 
E)  community 
A)  family 
B)  genotype 
C)  population 
D)  ecosystem 
E)  community

Question 14

What is heterozygote advantage? Provide one example of this and briefly explain.

Accepted Answer

Heterozygote advantage occurs when the h

Question 15

When phenotypes are favored at one extreme of a normal distribution, ____ selection occurs.

Accepted Answer

A)  stabilizing 
B)  directional 
C)  disruptive 
D)  abnormal 
E)  frequency-dependent 
A)  stabilizing 
B)  directional 
C)  disruptive 
D)  abnormal 
E)  frequency-dependent

Question 16

Table 19-1   Refer to the accompanying table. What is the frequency of the Dd genotype?

Accepted Answer

A)  0.1 
B)  0.2 
C)  0.4 
D)  0.6 
E)  0.8 
A)  0.1 
B)  0.2 
C)  0.4 
D)  0.6 
E)  0.8

Question 17

Figure 19-1   What type of selection is represented by the accompanying figure?

Accepted Answer

A)  no selection 
B)  natural selection 
C)  disruptive selection 
D)  stabilizing selection 
E)  directional selection 
A)  no selection 
B)  natural selection 
C)  disruptive selection 
D)  stabilizing selection 
E)  directional selection

Question 18

The observation by scientists that flies preferentially mate with those of similar phenotypes illustrates random mating.

Accepted Answer

A) True 
 B)False

Question 19

In nonrandom mating, each individual in a population has an equal chance of mating with any individual of the opposite sex. 
_________

Accepted Answer

A) True 
 B)False

Question 20

Discuss how genetic variability is maintained through genetic polymorphism.

Accepted Answer

Genetic variability is maintai

Exam 19: Evolutionary Change in Populations

When a population goes through a bottleneck, genetic drift occurs in the large population of survivors of a severe change in environment. ___________

Frequency-dependent selection acts to decrease the frequency of which phenotype in a population?

A population of people who have lived in the middle of the jungle for thousands of years without coming in contact with other individuals would show evidence of:

The movement of 25-year-old fertile individuals between Mexico and Canada will eventually contribute to:

The allele for sickle cell anemia is maintained in populations by frequency dependent selection . _______________

What best describes all of the alleles for all the loci present in a population?

The Hardy-Weinberg principle is applicable provided that migration:

If individuals in the same town continue to only mate with other individuals from the same town, one would expect to see an increase in ____ within the population.

Variation that does not alter the ability of an individual to survive and reproduce is therefore considered:

If a population of 1000 individuals has 120 aa genotypes, 460 Aa genotypes, and 420 AA genotypes, what is the allele frequency of the dominant allele (A)?

If an animal population is diploid, then each individual possesses:

Bacterial populations have been exposed to an antibiotic and have developed resistance to the antibiotic over time. Would this be an example of stabilizing selection, directional selection, or disruptive selection? Explain your reasoning.

A ____ consists of all of the individuals of the same species that inhabit a particular place at the same time.

What is heterozygote advantage? Provide one example of this and briefly explain.

When phenotypes are favored at one extreme of a normal distribution, ____ selection occurs.

Table 19-1 Refer to the accompanying table. What is the frequency of the Dd genotype?

Figure 19-1 What type of selection is represented by the accompanying figure?

The observation by scientists that flies preferentially mate with those of similar phenotypes illustrates random mating.

In nonrandom mating, each individual in a population has an equal chance of mating with any individual of the opposite sex. _________

Discuss how genetic variability is maintained through genetic polymorphism.

A View of Life

Atoms and Molecules the Chemical Basis of Life

The Chemistry of Life Organic Compounds

Organization of the Cell

Biological Membranes

Cell Communication

Energy and Metabolism

How Cells Make Atp Energy-Releasing Pathways

Photosynthesis Capturing Light Energy

Chromosomes, Mitosis, and Meiosis

The Basic Principles of Heredity

Dna the Carrier of Genetic Information

Gene Expression

Gene Regulation

Dna Technology and Genomics

Human Genetics and the Human Genome

Developmental Genetics

Introduction to Darwinian Evolution

Speciation and Macroevolution

The Origin and Evolutionary History of Life

The Evolution of Primates

Understanding Diversity Systematics

Viruses and Subviral Agents

Bacteria and Archaea

Protists

Seedless Plants

Seed Plants

The Fungi

An Introduction to Animal Diversity

Sponges, Cnidarians, Ctenophores, and Protostomes

The Deuterostomes

Plant Structure Growth and Development

Leaf Structure and Function

Stem Structure and Transport

Roots and Mineral Nutrition

Reproduction in Flowering Plants

Plant Developmental Responses to External and Internal Signals

Animal Structure and Function an Introduction

Protection Support and Movement

Neural Signaling

Neural Regulation

Sensory Systems

Internal Transport

The Immune System Internal Defense

Gas Exchange

Processing Food and Nutrition

Osmoregulation and Disposal of Metabolic Wastes

Endocrine Regulation

Reproduction

Animal Development

Animal Behavior

Introduction to Ecology Population Ecology

Community Ecology

Ecosystems and the Biosphere

Ecology and the Geography of Life

Biological Diversity and Conservation Biology

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