Question 1

Nondisjunction in somatic cells can result in aneuploid cells. This may give rise to:

Accepted Answer

A)  Down syndrome. 
B)  Turner syndrome. 
C)  Klinefelter syndrome. 
D)  cancer. 
E)  cri-du-chat syndrome. 
A)  Down syndrome. 
B)  Turner syndrome. 
C)  Klinefelter syndrome. 
D)  cancer. 
E)  cri-du-chat syndrome.

Question 2

What percent of males have some degree of color blindness?

Accepted Answer

A)  0.5 percent 
B)  5 percent 
C)  0.8 percent 
D)  8 percent 
E)  10 percent 
A)  0.5 percent 
B)  5 percent 
C)  0.8 percent 
D)  8 percent 
E)  10 percent

Question 3

Red-green color blindness is an X-linked recessive trait in humans. A color-blind woman and a man with normal vision have a son. What is the probability that the son is color blind?

Accepted Answer

A)  100 percent 
B)  75 percent 
C)  50 percent 
D)  25 percent 
E)  0 percent 
A)  100 percent 
B)  75 percent 
C)  50 percent 
D)  25 percent 
E)  0 percent

Question 4

If one of your parents has Huntington disease and is heterozygous for the disorder, you have a 50 percent chance of inheriting the disease.

Accepted Answer

A) True 
 B)False

Question 5

Refer to the figure below, and then answer the question that follows.  
-The last members of the Russian Royal Family were executed during the Russian Revolution. Assume the revolution never took place and Alexis, son of Czar Nicholas II and Alexandra, survived and married into the British Royal Family. What is the probability that his children would have hemophilia? What is the probability his children would be carriers for hemophilia?

Accepted Answer

Alexis had hemophilia, which is an X-lin

Question 6

What single attribute determines that a human fetus is male?

Accepted Answer

A)  the absence of a second X chromosome 
B)  the absence of a Y chromosome 
C)  the presence of a Y chromosome 
D)  the presence of two X chromosomes 
A)  the absence of a second X chromosome 
B)  the absence of a Y chromosome 
C)  the presence of a Y chromosome 
D)  the presence of two X chromosomes

Question 7

Which condition or disease is caused by aneuploidy?

Accepted Answer

A)  sickle-cell anemia 
B)  hemophilia 
C)  malaria 
D)  color blindness 
E)  Down syndrome 
A)  sickle-cell anemia 
B)  hemophilia 
C)  malaria 
D)  color blindness 
E)  Down syndrome

Question 8

Hemophelia is an X-linked recessive disorder. A mother without the allele and a father with the allele have a daughter. The daughter then marries a man with hemophilia. What is the genotype of the daughter? What is the probability that the daughter's children will develop the disease?

Accepted Answer

A Punnett square will show tha

Question 9

Which of the following is an autosomal recessive disorder?

Accepted Answer

A)  hemophilia 
B)  Huntington disease 
C)  Down syndrome 
D)  sickle-cell anemia 
E)  Turner syndrome 
A)  hemophilia 
B)  Huntington disease 
C)  Down syndrome 
D)  sickle-cell anemia 
E)  Turner syndrome

Question 10

If a disease is caused by a dominant allele, it means that a person with the disease:

Accepted Answer

A)  will always pass it on to all their children. 
B)  will pass it on to one-fourth of their children. 
C)  must be homozygous dominant for the allele. 
D)  must be heterozygous for the allele. 
E)  could be either homozygous or heterozygous for the allele. 
A)  will always pass it on to all their children. 
B)  will pass it on to one-fourth of their children. 
C)  must be homozygous dominant for the allele. 
D)  must be heterozygous for the allele. 
E)  could be either homozygous or heterozygous for the allele.

Question 11

A trait such as albinism is seen with equal frequency in males and females. Two people who do not have the trait might have offspring who do have the trait, at a frequency of approximately one in four. What can you conclude about the inheritance of this trait?

Accepted Answer

A)  recessive, X-linked 
B)  recessive, autosomal 
C)  recessive, caused by polyploidy 
D)  dominant, X-linked 
E)  dominant, autosomal 
A)  recessive, X-linked 
B)  recessive, autosomal 
C)  recessive, caused by polyploidy 
D)  dominant, X-linked 
E)  dominant, autosomal

Question 12

A carrier for a genetic disorder will pass the allele to all of their offspring.

Accepted Answer

A) True 
 B)False

Question 13

A person must have two alleles for hemoglobin S in order to suffer from sickle-cell anemia.

Accepted Answer

A) True 
 B)False

Question 14

Cri-du-chat syndrome babies are mentally challenged and have an abnormal larynx that makes sounds like the cry of a cat. This disorder is due to a/an:

Accepted Answer

A)  deletion in chromosome 5. 
B)  inversion in chromosome 2. 
C)  translocation between chromosome 9 and 22. 
D)  duplication in chromosome 7. 
E)  trisomy 21. 
A)  deletion in chromosome 5. 
B)  inversion in chromosome 2. 
C)  translocation between chromosome 9 and 22. 
D)  duplication in chromosome 7. 
E)  trisomy 21.

Question 15

What do hemophilia, Duchenne muscular dystrophy, and red-green color blindness have in common?

Accepted Answer

A)  They are X-linked. 
B)  They are more common in females than in males. 
C)  They are caused by inheritance of an extra sex chromosome. 
D)  They are caused by inheritance of an extra autosome. 
E)  The gene that causes them is on the Y chromosome. 
A)  They are X-linked. 
B)  They are more common in females than in males. 
C)  They are caused by inheritance of an extra sex chromosome. 
D)  They are caused by inheritance of an extra autosome. 
E)  The gene that causes them is on the Y chromosome.

Question 16

A pedigree is a representation of:

Accepted Answer

A)  a genetic family tree. 
B)  a series of chromosomes arranged in order. 
C)  the inheritance pattern of recessive disorders. 
D)  the inheritance pattern of dominant disorders. 
E)  all the genetic disorders that can be inherited. 
A)  a genetic family tree. 
B)  a series of chromosomes arranged in order. 
C)  the inheritance pattern of recessive disorders. 
D)  the inheritance pattern of dominant disorders. 
E)  all the genetic disorders that can be inherited.

Question 17

What is a recessive disorder?

Accepted Answer

A)  a genetic disorder with two functioning alleles 
B)  a genetic disorder that will express itself in the presence of one functioning allele 
C)  a genetic disorder that will express itself in the presence of two recessive alleles 
D)  a genetic disorder that involves change in chromosome number 
E)  a genetic disorder that involves change in chromosome structure 
A)  a genetic disorder with two functioning alleles 
B)  a genetic disorder that will express itself in the presence of one functioning allele 
C)  a genetic disorder that will express itself in the presence of two recessive alleles 
D)  a genetic disorder that involves change in chromosome number 
E)  a genetic disorder that involves change in chromosome structure

Question 18

Refer to the figure below, and then answer the question that follows.  
-Nondisjunction in meiosis gives rise to gametes with abnormal chromosome numbers. Which event is likely to produce a higher percentage of abnormal gametes?

Accepted Answer

A)  failure of homologous chromosomes to separate at meiosis I 
B)  failure of homologous chromosomes to separate at meiosis II 
C)  failure of sister chromatids to separate at meiosis I 
D)  failure of sister chromatids to separate at meiosis II 
E)  failure of sister chromatids to separate at mitosis 
A)  failure of homologous chromosomes to separate at meiosis I 
B)  failure of homologous chromosomes to separate at meiosis II 
C)  failure of sister chromatids to separate at meiosis I 
D)  failure of sister chromatids to separate at meiosis II 
E)  failure of sister chromatids to separate at mitosis

Question 19

In humans, aneuploidy is fairly common yet goes largely unrecognized as a genetic problem. This is because:

Accepted Answer

A)  it produces autosomal recessive individuals who don't always express the disorder. 
B)  its effects are usually hidden. 
C)  it actually produces healthy individuals. 
D)  it often results in miscarriage of embryos. 
A)  it produces autosomal recessive individuals who don't always express the disorder. 
B)  its effects are usually hidden. 
C)  it actually produces healthy individuals. 
D)  it often results in miscarriage of embryos.

Question 20

You have studied the presence of a trait in the members of three generations of a family. With this information, you constructed a ________ to track how the trait was passed down through the generations.

Accepted Answer

The answer of You have studied the presence of a...

Exam 12: Units of Heredity: Chromosomes and Inheritance

Nondisjunction in somatic cells can result in aneuploid cells. This may give rise to:

What percent of males have some degree of color blindness?

Red-green color blindness is an X-linked recessive trait in humans. A color-blind woman and a man with normal vision have a son. What is the probability that the son is color blind?

If one of your parents has Huntington disease and is heterozygous for the disorder, you have a 50 percent chance of inheriting the disease.

What single attribute determines that a human fetus is male?

Which condition or disease is caused by aneuploidy?

Hemophelia is an X-linked recessive disorder. A mother without the allele and a father with the allele have a daughter. The daughter then marries a man with hemophilia. What is the genotype of the daughter? What is the probability that the daughter's children will develop the disease?

Which of the following is an autosomal recessive disorder?

If a disease is caused by a dominant allele, it means that a person with the disease:

A trait such as albinism is seen with equal frequency in males and females. Two people who do not have the trait might have offspring who do have the trait, at a frequency of approximately one in four. What can you conclude about the inheritance of this trait?

A carrier for a genetic disorder will pass the allele to all of their offspring.

A person must have two alleles for hemoglobin S in order to suffer from sickle-cell anemia.

Cri-du-chat syndrome babies are mentally challenged and have an abnormal larynx that makes sounds like the cry of a cat. This disorder is due to a/an:

What do hemophilia, Duchenne muscular dystrophy, and red-green color blindness have in common?

A pedigree is a representation of:

What is a recessive disorder?

Refer to the figure below, and then answer the question that follows. -Nondisjunction in meiosis gives rise to gametes with abnormal chromosome numbers. Which event is likely to produce a higher percentage of abnormal gametes?

In humans, aneuploidy is fairly common yet goes largely unrecognized as a genetic problem. This is because:

You have studied the presence of a trait in the members of three generations of a family. With this information, you constructed a ________ to track how the trait was passed down through the generations.

Science As a Way of Learning: a Guide to the Natural World

Fundamental Building Blocks: Chemistry, Water, and Ph

Lifes Components: Biological Molecules

Lifes Home: the Cell

Lifes Border: the Plasma Membrane

Lifes Mainspring: an Introduction to Energy

Vital Harvest: Deriving Energy From Food

The Green Worlds Gift: Photosynthesis

The Links in Lifes Chain: Genetics and Cell Division

Preparing for Sexual Reproduction: Meiosis

The First Geneticist: Mendel and His Discoveries

Passing on Lifes Information: Dna Structure and Replication

How Proteins Are Made: Genetic Transcription, Translation, and Regulation

The Future Isnt What It Used to Be: Biotechnology

An Introduction to Evolution: Charles Darwin, Evolutionary Thought, and the Evidence for Evolution

The Means of Evolution: Microevolution

The Outcomes of Evolution: Macroevolution

A Slow Unfolding: the History of Life on Earth

Arriving Late, Traveling Far: the Evolution of Human Beings

Viruses, Bacteria, Archaea, and Protists: the Diversity of Life 1

Fungi : the Diversity of Life 2

Animals: the Diversity of Life 3

Plants: the Diversity of Life 4

The Angiosperms: Form and Function in Flowering Plants

Body Support and Movement: the Integumentary, Skeletal, and Muscular Systems

Communication and Control 1: the Nervous System

Communication and Control 2: the Endocrine System

Defending the Body: the Immune System

Transport and Exchange 1: Blood and Breath

Transport and Exchange 2: Digestion, Nutrition, and Elimination

An Amazingly Detailed Script: Animal Development

How the Baby Came to Be: Human Reproduction

An Interactive Living World 1: Populations in Ecology

An Interactive Living World 2: Communities in Ecology

An Interactive Living World 3: Ecosystems and Biomes

Filters