Question 1

Seriously abnormal phenotypes or harmful mutations are acted against or reduced to low frequencies by:

Accepted Answer

A)  beneficial mutations. 
B)  gene flow. 
C)  disruptive selection. 
D)  genetic drift. 
E)  natural selection. 
A)  beneficial mutations. 
B)  gene flow. 
C)  disruptive selection. 
D)  genetic drift. 
E)  natural selection.

Question 2

Figure 19-5
Use the figure to answer the corresponding question(s).  
-The distribution of phenotypes for human birth weight is a good example of:

Accepted Answer

A)  the founder effect. 
B)  genetic drift. 
C)  directional selection. 
D)  disruptive selection. 
E)  stabilizing selection. 
A)  the founder effect. 
B)  genetic drift. 
C)  directional selection. 
D)  disruptive selection. 
E)  stabilizing selection.

Question 3

__________ is thought to be due to increased homozygosity.

Accepted Answer

A)  The founder effect 
B)  Genetic drift 
C)  Inbreeding depression 
D)  Heterozygote advantage 
E)  Gene flow 
A)  The founder effect 
B)  Genetic drift 
C)  Inbreeding depression 
D)  Heterozygote advantage 
E)  Gene flow

Question 4

MATCHING
Match the evolution vocabulary definition
a.microevolutiom
d.cline
b.fitness
e.balanced polymorphisms
c.natural selection
-average number of surviving organisms of one genotype compared to competing genotypes

Accepted Answer

The answer of MATCHING
Match the evolution vocabulary definition
a.microevolutiom
d.cline
b.fitness
e.balanced polymorphisms
c.natural selection
-average...

Question 5

The Hardy-Weinberg principle is applicable provided:

Accepted Answer

A)  matings between individuals are nonrandom. 
B)  matings between families occur preferentially. 
C)  matings between individuals of different genotypes occur preferentially. 
D)  matings between individuals are random. 
E)  matings between individuals of the same genotypes occur preferentially. 
A)  matings between individuals are nonrandom. 
B)  matings between families occur preferentially. 
C)  matings between individuals of different genotypes occur preferentially. 
D)  matings between individuals are random. 
E)  matings between individuals of the same genotypes occur preferentially.

Question 6

The overuse of antibiotics has led to a form of antibiotic resistant tuberculosis.This has occurred as a result of:

Accepted Answer

A)  directional selection within the bacterial population. 
B)  stabilizing selection within the bacterial population. 
C)  disruptive selection within the bacterial population. 
D)  a heterozygote advantage within the bacterial population. 
E)  balanced polymorphism within the bacterial population. 
A)  directional selection within the bacterial population. 
B)  stabilizing selection within the bacterial population. 
C)  disruptive selection within the bacterial population. 
D)  a heterozygote advantage within the bacterial population. 
E)  balanced polymorphism within the bacterial population.

Question 7

In a certain population, the allele causing sickle cell anemia has an allele frequency of 0.2.If the population is in genetic equilibrium for this allele, what fraction of the population would be carriers for the allele?

Accepted Answer

A)  0.24 
B)  0.32 
C)  0.42 
D)  0.48 
E)  0.80 
A)  0.24 
B)  0.32 
C)  0.42 
D)  0.48 
E)  0.80

Question 8

The only process that can lead to adaptations and directed genetic change of a population is:

Accepted Answer

A)  natural selection. 
B)  mutation. 
C)  migration. 
D)  genetic drift. 
E)  inbreeding. 
A)  natural selection. 
B)  mutation. 
C)  migration. 
D)  genetic drift. 
E)  inbreeding.

Question 9

If a population of 1000 individuals has 160 aa genotypes, 320 Aa genotypes, and 520 AA genotypes, the allele frequency of the dominant allele (A) is:

Accepted Answer

A)  0.16 
B)  0.42. 
C)  0.52. 
D)  0.68. 
E)  0.89. 
A)  0.16 
B)  0.42. 
C)  0.52. 
D)  0.68. 
E)  0.89.

Question 10

If a population of 1000 individuals has 160 aa genotypes, the genotype frequency of the aa genotype is:

Accepted Answer

A)  0.016. 
B)  0.08. 
C)  0.16. 
D)  0.8. 
E)  1.0. 
A)  0.016. 
B)  0.08. 
C)  0.16. 
D)  0.8. 
E)  1.0.

Question 11

Random evolutionary changes in a small breeding population is known as:

Accepted Answer

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

Question 12

In a certain population, 40 of every 1,000 births results in an individual that suffers from cystic fibrosis.What is the allele frequency for the recessive allele that causes cystic fibrosis?

Accepted Answer

A)  0.004 
B)  0.02 
C)  0.2 
D)  0.4 
E)  0.8 
A)  0.004 
B)  0.02 
C)  0.2 
D)  0.4 
E)  0.8

Question 13

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 14

Which of the following statements is not true about natural selection?

Accepted Answer

A)  Offspring of individuals that are better adapted will make up a larger proportion of the next generation. 
B)  Natural selection directs evolution by preserving traits acquired during an individual's lifetime. 
C)  Natural selection depends on the genetic variability in a population, which arises through mutations. 
D)  Natural selection acts to preserve favorable traits and eliminate unfavorable traits. 
E)  Natural selection leads to adaptive evolutionary change. 
A)  Offspring of individuals that are better adapted will make up a larger proportion of the next generation. 
B)  Natural selection directs evolution by preserving traits acquired during an individual's lifetime. 
C)  Natural selection depends on the genetic variability in a population, which arises through mutations. 
D)  Natural selection acts to preserve favorable traits and eliminate unfavorable traits. 
E)  Natural selection leads to adaptive evolutionary change.

Question 15

If all of the alleles of a given locus are the same in a population, then the frequency of that allele is assigned a value of:

Accepted Answer

A)  0.1. 
B)  1.0. 
C)  10.0. 
D)  100.0. 
E)  1000.0. 
A)  0.1. 
B)  1.0. 
C)  10.0. 
D)  100.0. 
E)  1000.0.

Question 16

What is the correct equation for the Hardy-Weinberg principle?

Accepted Answer

A)  p2 + 2pq2 + q2 + q2 = 100 
B)  p2 + 2p + 2q + q2 = 1 
C)  p2 - 2pq + q2 = 1 
D)  2p2 + 2pq + 2q2 = 1000 
E)  p2 + 2pq + q2 = 1 
A)  p2 + 2pq2 + q2 + q2 = 100 
B)  p2 + 2p + 2q + q2 = 1 
C)  p2 - 2pq + q2 = 1 
D)  2p2 + 2pq + 2q2 = 1000 
E)  p2 + 2pq + q2 = 1

Question 17

Discuss how two of the following alter allele frequencies in populations: nonrandom mating, genetic drift, gene flow, and natural selection.

Accepted Answer

Gene flow can alter allelle frequencies

Question 18

Positive assortative mating in a population will:

Accepted Answer

A)  produces more mutations each generation. 
B)  causes natural selection. 
C)  changes allele frequencies. 
D)  stabilizes genotype frequencies. 
E)  increases homozygosity. 
A)  produces more mutations each generation. 
B)  causes natural selection. 
C)  changes allele frequencies. 
D)  stabilizes genotype frequencies. 
E)  increases homozygosity.

Question 19

The study of the genetic variability within a population and the forces that change allele frequencies is:

Accepted Answer

A)  variation ecology. 
B)  evolutionary genetics. 
C)  population genetics. 
D)  cytogenetics. 
E)  allele genetics. 
A)  variation ecology. 
B)  evolutionary genetics. 
C)  population genetics. 
D)  cytogenetics. 
E)  allele genetics.

Exam 19: Evolutionary Change in Populations

Seriously abnormal phenotypes or harmful mutations are acted against or reduced to low frequencies by:

Figure 19-5 Use the figure to answer the corresponding question(s). -The distribution of phenotypes for human birth weight is a good example of:

__________ is thought to be due to increased homozygosity.

MATCHING Match the evolution vocabulary definition a.microevolutiom d.cline b.fitness e.balanced polymorphisms c.natural selection -average number of surviving organisms of one genotype compared to competing genotypes

The Hardy-Weinberg principle is applicable provided:

The overuse of antibiotics has led to a form of antibiotic resistant tuberculosis.This has occurred as a result of:

In a certain population, the allele causing sickle cell anemia has an allele frequency of 0.2.If the population is in genetic equilibrium for this allele, what fraction of the population would be carriers for the allele?

The only process that can lead to adaptations and directed genetic change of a population is:

If a population of 1000 individuals has 160 aa genotypes, 320 Aa genotypes, and 520 AA genotypes, the allele frequency of the dominant allele (A) is:

If a population of 1000 individuals has 160 aa genotypes, the genotype frequency of the aa genotype is:

Random evolutionary changes in a small breeding population is known as:

In a certain population, 40 of every 1,000 births results in an individual that suffers from cystic fibrosis.What is the allele frequency for the recessive allele that causes cystic fibrosis?

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

Which of the following statements is not true about natural selection?

If all of the alleles of a given locus are the same in a population, then the frequency of that allele is assigned a value of:

What is the correct equation for the Hardy-Weinberg principle?

Discuss how two of the following alter allele frequencies in populations: nonrandom mating, genetic drift, gene flow, and natural selection.

Positive assortative mating in a population will:

The study of the genetic variability within a population and the forces that change allele frequencies is:

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

Filters