Question 1

In ______,people with a serious genetic disorder are not permitted to have children.

Accepted Answer

A)  the United States 
B)  England 
C)  China 
D)  Russia 
E)  All of these 
A)  the United States 
B)  England 
C)  China 
D)  Russia 
E)  All of these C

Question 2

In the science fiction film When Worlds Collide,100 individuals are selected to leave a doomed Earth in a spaceship to re-establish humanity elsewhere.This scenario illustrates

Accepted Answer

A)  a founder effect. 
B)  a mutation effect. 
C)  a population funnel. 
D)  a deleterious allele. 
E)  new mutation. 
A)  a founder effect. 
B)  a mutation effect. 
C)  a population funnel. 
D)  a deleterious allele. 
E)  new mutation. A

Question 3

A small group of islanders leave "island A" and travel to "island B." After several generations on island B,a researcher finds that a large percentage of the population is left-handed.Left-handedness is a relatively rare trait on island A.A genetic event that explains this is

Accepted Answer

A) a population bottleneck. 
B) genetic load. 
C) a founder effect. 
D) natural selection. 
E) Hardy-Weinberg equilibrium. 
A) a population bottleneck. 
B) genetic load. 
C) a founder effect. 
D) natural selection. 
E) Hardy-Weinberg equilibrium. C

Question 4

In human populations,Hardy-Weinberg equilibrium is seen

Accepted Answer

A)  in small, isolated communities. 
B)  in populations with many immigrants. 
C)  in communities founded by a small number of people. 
D)  infrequently and in large communities with random mating. 
E)  in populations that have been through bottlenecks. 
A)  in small, isolated communities. 
B)  in populations with many immigrants. 
C)  in communities founded by a small number of people. 
D)  infrequently and in large communities with random mating. 
E)  in populations that have been through bottlenecks.

Question 5

Clines are created when

Accepted Answer

A)  emigrants remove alleles and immigrants introduce alleles. 
B)  immigrants remove alleles and emigrants introduce alleles. 
C)  different genes mutate in different geographical regions. 
D)  uncles have children with nieces as part of the culture. 
E)  being a heterozygote for a particular gene protects against an infectious disease. 
A)  emigrants remove alleles and immigrants introduce alleles. 
B)  immigrants remove alleles and emigrants introduce alleles. 
C)  different genes mutate in different geographical regions. 
D)  uncles have children with nieces as part of the culture. 
E)  being a heterozygote for a particular gene protects against an infectious disease.

Question 6

Control of human reproduction to achieve a societal goal is called

Accepted Answer

A)  biogenics. 
B)  eugenics. 
C)  biodiversity. 
D)  genetic engineering. 
E)  natural selection. 
A)  biogenics. 
B)  eugenics. 
C)  biodiversity. 
D)  genetic engineering. 
E)  natural selection.

Question 7

To determine the evolutionary history of a gene,geneticists assume that the most prevalent alleles in a population

Accepted Answer

A)  are dominant. 
B)  have mutated the most. 
C)  are the oldest. 
D)  are the most recently acquired. 
E)  have mutated because of radiation exposure. 
A)  are dominant. 
B)  have mutated the most. 
C)  are the oldest. 
D)  are the most recently acquired. 
E)  have mutated because of radiation exposure.

Question 8

In an endogamous community,

Accepted Answer

A)  many people marry people from within the community. 
B)  many people marry people from another country. 
C)  many people marry blood relatives. 
D)  many people own dogs. 
E)  many people have dominant genetic disorders. 
A)  many people marry people from within the community. 
B)  many people marry people from another country. 
C)  many people marry blood relatives. 
D)  many people own dogs. 
E)  many people have dominant genetic disorders.

Question 9

Genetic disorders such as Tay-Sachs disease,Bloom syndrome,Gaucher disease and Canavan disease are more common in Ashkenazi Jewish populations because

Accepted Answer

A)  spontaneous mutations occur more frequently in this group. 
B)  the gene pool has been highly variable over thousands of years. 
C)  microevolution has not influenced this culture. 
D)  their history includes several population bottlenecks. 
E)  genetic screening programs identify carriers. 
A)  spontaneous mutations occur more frequently in this group. 
B)  the gene pool has been highly variable over thousands of years. 
C)  microevolution has not influenced this culture. 
D)  their history includes several population bottlenecks. 
E)  genetic screening programs identify carriers.

Question 10

Darwin bred pigeons to have particular traits.Today people breed dogs,cats,horses,and other animals for the same reason.These activities illustrate

Accepted Answer

A)  negative selection. 
B)  positive selection. 
C)  artificial selection. 
D)  veterinary selection. 
E)  agricultural selection. 
A)  negative selection. 
B)  positive selection. 
C)  artificial selection. 
D)  veterinary selection. 
E)  agricultural selection.

Question 11

_______ in the mycobacterium tuberculosis population reduced the incidence and virulence of tuberculosis in the early twentieth century.

Accepted Answer

A)  Natural selection 
B)  Mutation 
C)  Migration 
D)  Nonrandom mating 
E)  Genetic drift 
A)  Natural selection 
B)  Mutation 
C)  Migration 
D)  Nonrandom mating 
E)  Genetic drift

Question 12

The fact that nearly everyone on the island of Sardinia has the same X chromosome sequence indicates that the population has experienced

Accepted Answer

A)  mutation. 
B)  natural selection. 
C)  nonrandom mating. 
D)  gene therapy. 
E)  consanguinity. 
A)  mutation. 
B)  natural selection. 
C)  nonrandom mating. 
D)  gene therapy. 
E)  consanguinity.

Question 13

Natural selection can alter gene frequencies in a population because

Accepted Answer

A)  carriers of inherited disease rarely survive to reproduce. 
B)  it maintains alleles that improve survival to sexual maturity. 
C)  it compensates for defects caused by deleterious alleles. 
D)  individuals with deleterious alleles selectively interbreed. 
E)  alleles are in Hardy-Weinberg equilibrium. 
A)  carriers of inherited disease rarely survive to reproduce. 
B)  it maintains alleles that improve survival to sexual maturity. 
C)  it compensates for defects caused by deleterious alleles. 
D)  individuals with deleterious alleles selectively interbreed. 
E)  alleles are in Hardy-Weinberg equilibrium.

Question 14

Resistance of sickle cell disease carriers to malaria illustrates

Accepted Answer

A)  genetic drift. 
B)  a population bottleneck. 
C)  balanced polymorphism. 
D)  a founder effect. 
E)  migration. 
A)  genetic drift. 
B)  a population bottleneck. 
C)  balanced polymorphism. 
D)  a founder effect. 
E)  migration.

Question 15

Consanguineous marriages are between men and women who are

Accepted Answer

A)  from different cultures. 
B)  "blood" relatives. 
C)  carriers of a disorder. 
D)  from the same town. 
E)  too young to be married. 
A)  from different cultures. 
B)  "blood" relatives. 
C)  carriers of a disorder. 
D)  from the same town. 
E)  too young to be married.

Question 16

_______ in the human population reduced the incidence and virulence of tuberculosis in the early twentieth century.

Accepted Answer

A)  Natural selection 
B)  Mutation 
C)  Migration 
D)  Nonrandom mating 
E)  Genetic drift 
A)  Natural selection 
B)  Mutation 
C)  Migration 
D)  Nonrandom mating 
E)  Genetic drift

Question 17

A founder effect occurs when

Accepted Answer

A)  whole populations migrate after a natural disaster. 
B)  geographic barriers separate populations. 
C)  small groups of individuals leave a population to start their own. 
D)  individuals in a population have few children. 
E)  mutation introduces a new allele into a population. 
A)  whole populations migrate after a natural disaster. 
B)  geographic barriers separate populations. 
C)  small groups of individuals leave a population to start their own. 
D)  individuals in a population have few children. 
E)  mutation introduces a new allele into a population.

Question 18

The collection of deleterious alleles in a population is called the

Accepted Answer

A)  mutation load. 
B)  mutation bottleneck. 
C)  genetic load. 
D)  genome polymorphism. 
E)  mutant allele. 
A)  mutation load. 
B)  mutation bottleneck. 
C)  genetic load. 
D)  genome polymorphism. 
E)  mutant allele.

Question 19

The population of HIV variants in a person's body changes during the course of infection due to

Accepted Answer

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

Question 20

Deleterious alleles are eliminated from populations by

Accepted Answer

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

Exam 15: Changing Allele Frequencies

In ______,people with a serious genetic disorder are not permitted to have children.

In the science fiction film When Worlds Collide,100 individuals are selected to leave a doomed Earth in a spaceship to re-establish humanity elsewhere.This scenario illustrates

A small group of islanders leave "island A" and travel to "island B." After several generations on island B,a researcher finds that a large percentage of the population is left-handed.Left-handedness is a relatively rare trait on island A.A genetic event that explains this is

In human populations,Hardy-Weinberg equilibrium is seen

Clines are created when

Control of human reproduction to achieve a societal goal is called

To determine the evolutionary history of a gene,geneticists assume that the most prevalent alleles in a population

In an endogamous community,

Genetic disorders such as Tay-Sachs disease,Bloom syndrome,Gaucher disease and Canavan disease are more common in Ashkenazi Jewish populations because

Darwin bred pigeons to have particular traits.Today people breed dogs,cats,horses,and other animals for the same reason.These activities illustrate

_______ in the mycobacterium tuberculosis population reduced the incidence and virulence of tuberculosis in the early twentieth century.

The fact that nearly everyone on the island of Sardinia has the same X chromosome sequence indicates that the population has experienced

Natural selection can alter gene frequencies in a population because

Resistance of sickle cell disease carriers to malaria illustrates

Consanguineous marriages are between men and women who are

_______ in the human population reduced the incidence and virulence of tuberculosis in the early twentieth century.

A founder effect occurs when

The collection of deleterious alleles in a population is called the

The population of HIV variants in a person's body changes during the course of infection due to

Deleterious alleles are eliminated from populations by

Overview of Genetics

Cells

Meiosis and Development

Single-Gene Inheritance

Beyond Mendels Law

Matters of Sex

Multifactorial Traits

Genetics of Behavior

DNA Structure and Replication

Gene Action: From Dna to Protein

Gene Expression and Epigenetics

Gene Mutation

Chromosomes

Constant Allele Frequencies

Human Ancestry

Genetics of Immunity

Genetics of Cancer

Genetic Technologies: Amplifying, Modifying, and Monitoring DNA

Genetic Testing and Treatment

Reproductive Technologies

Genomics

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