Question 1

Yellow pea color is dominant over green pea color, despite the observation that most store-bought, edible peas are green.

Accepted Answer

A) True 
 B)False

Question 2

Which disorder is more common among the babies of older mothers?

Accepted Answer

A)  Turner syndrome 
B)  Klinefelter syndrome 
C)  Trisomy X 
D)  XYY syndrome 
E)  Down syndrome 
A)  Turner syndrome 
B)  Klinefelter syndrome 
C)  Trisomy X 
D)  XYY syndrome 
E)  Down syndrome

Question 3

If, in a heterozygous individual, only one allele is expressed in the phenotype, that allele is

Accepted Answer

A)  potent. 
B)  dominant. 
C)  haploid. 
D)  recessive. 
E)  normal. 
A)  potent. 
B)  dominant. 
C)  haploid. 
D)  recessive. 
E)  normal.

Question 4

Color deficiency is more common in men than in women because

Accepted Answer

A)  women cannot inherit the gene from their fathers. 
B)  the gene is located on the Y chromosome. 
C)  men get more copies of the gene than do women. 
D)  crossing over occurs only in women. 
E)  men have only one X chromosome. 
A)  women cannot inherit the gene from their fathers. 
B)  the gene is located on the Y chromosome. 
C)  men get more copies of the gene than do women. 
D)  crossing over occurs only in women. 
E)  men have only one X chromosome.

Question 5

A recessive allele on the X chromosome causes color deficiency. A noncolor-deficient woman (whose father is color deficient) marries a color-deficient man. If they have a son, what is the chance that he will be color deficient?

Accepted Answer

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

Question 6

An individual who is a carrier for a sex-linked trait such as hemophilia

Accepted Answer

A)  cannot pass the gene on to his or her daughters. 
B)  is homozygous for the recessive condition. 
C)  is always female. 
D)  shows the dominant phenotype. 
A)  cannot pass the gene on to his or her daughters. 
B)  is homozygous for the recessive condition. 
C)  is always female. 
D)  shows the dominant phenotype.

Question 7

Sickle-cell anemia is caused by a recessive mutation in the hemoglobin gene. However, heterozygote individuals also show a small percentage of sickled red blood cells. What type of inheritance pattern is this an example of?

Accepted Answer

A)  Polygenic inheritance 
B)  Sex linked 
C)  Chromosomal nondisjunction 
D)  Incomplete dominance 
A)  Polygenic inheritance 
B)  Sex linked 
C)  Chromosomal nondisjunction 
D)  Incomplete dominance

Question 8

The results of a test cross reveal that all the offspring resemble the parent being tested. This parent must be

Accepted Answer

A)  self-pollinated. 
B)  recessive. 
C)  haploid. 
D)  homozygous. 
E)  heterozygous. 
A)  self-pollinated. 
B)  recessive. 
C)  haploid. 
D)  homozygous. 
E)  heterozygous.

Question 9

A type of muscular dystrophy shows sex-linked recessive inheritance. Affected persons usually die by the age of 20. Suppose that a boy with the disease lives long enough to marry a woman heterozygous for the trait. If they have a son, what is the probability that he will have the disease?

Accepted Answer

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

Question 10

All of the following are true regarding pedigree analysis EXCEPT that it

Accepted Answer

A)  documents the transmission of a genetic characteristic over two or more generations. 
B)  can incorporate molecular biology techniques. 
C)  is exclusively used to study the patterns of inheritance in dogs. 
D)  reveals whether a trait is dominant or recessive. 
A)  documents the transmission of a genetic characteristic over two or more generations. 
B)  can incorporate molecular biology techniques. 
C)  is exclusively used to study the patterns of inheritance in dogs. 
D)  reveals whether a trait is dominant or recessive.

Question 11

The human genome contains 46 chromosomes. There are 22 pairs of __________(type of chromosome) and one pair of__________ (type of chromosome).

Accepted Answer

autosomes;

Question 12

A(n)__________ is a portion of DNA that resides at a particular locus or site on a chromosome and encodes a particular function.

Accepted Answer

The answer of A(n)__________ is a portion of DNA that...

Question 13

The physical manifestation of an organismʹs genes is its

Accepted Answer

A)  environment. 
B)  genotype. 
C)  phenotype. 
D)  number of chromosomes. 
E)  genetic code. 
A)  environment. 
B)  genotype. 
C)  phenotype. 
D)  number of chromosomes. 
E)  genetic code.

Question 14

Describe where in the process of meiosis independent assortment of genes occurs.

Accepted Answer

Homologous pairs of chromosome

Question 15

In people, a dimpled chin is an autosomal dominant trait. Many famous celebrities, such as John Travolta and Michael and Kirk Douglas, have this condition. Assume that the wrestler and actor Hulk Hogan is homozygous for the dimpled chin, and he married a woman with a round chin. They had two children, Brooke and Nick. What is the probability that their children will show the trait?

Accepted Answer

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

Question 16

If an individual who is homozygous for type B blood marries a heterozygous type A individual, what is the chance that their first child will have type AB blood?

Accepted Answer

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

Question 17

What are the possible gamete genotypes of an organism that has the genotype HhTt if the two genes are located on separate chromosomes and therefore not linked?

Accepted Answer

The answer of What are the possible gamete genotypes of...

Question 18

Imagine that smurfs live in widely separated groups and rarely interbreed, so geneticists know very little about them. On one occasion, two smurfs from different groups did mate. A big -footed, white smurf mated with a small-footed, blue smurf. Three offspring resulted: one big-footed and blue and two small-footed and blue. Which statement about the inheritance of color in smurfs is most likely to be correct?

Accepted Answer

A)  White is dominant to blue. 
B)  White and blue are codominant. 
C)  Blue is dominant to white. 
A)  White is dominant to blue. 
B)  White and blue are codominant. 
C)  Blue is dominant to white.

Question 19

In pea plants, tall plants are dominant over short, and green pods are dominant over yellow. If you crossed true-breeding tall, green-podded plants with true-breeding short, yellow-podded plants, and then crossed the F1 individuals among themselves, what proportion of the F2 offspring would you expect to be tall and yellow-podded?

Accepted Answer

A)  1/4 
B)  1/16 
C)  3/16 
D)  3/4 
E)  9/16 
A)  1/4 
B)  1/16 
C)  3/16 
D)  3/4 
E)  9/16

Question 20

A child is born with dwarfism (tt). His parents are of normal height. Which of the following must be TRUE of the parents?

Accepted Answer

A)  They are both homozygous recessive dwarf. 
B)  They are both heterozygous tall. 
C)  They are both heterozygous dwarf. 
D)  They are both homozygous dominant tall. 
A)  They are both homozygous recessive dwarf. 
B)  They are both heterozygous tall. 
C)  They are both heterozygous dwarf. 
D)  They are both homozygous dominant tall.

Exam 11: Patterns of Inheritance

Yellow pea color is dominant over green pea color, despite the observation that most store-bought, edible peas are green.

Which disorder is more common among the babies of older mothers?

If, in a heterozygous individual, only one allele is expressed in the phenotype, that allele is

Color deficiency is more common in men than in women because

A recessive allele on the X chromosome causes color deficiency. A noncolor-deficient woman (whose father is color deficient) marries a color-deficient man. If they have a son, what is the chance that he will be color deficient?

An individual who is a carrier for a sex-linked trait such as hemophilia

Sickle-cell anemia is caused by a recessive mutation in the hemoglobin gene. However, heterozygote individuals also show a small percentage of sickled red blood cells. What type of inheritance pattern is this an example of?

The results of a test cross reveal that all the offspring resemble the parent being tested. This parent must be

A type of muscular dystrophy shows sex-linked recessive inheritance. Affected persons usually die by the age of 20. Suppose that a boy with the disease lives long enough to marry a woman heterozygous for the trait. If they have a son, what is the probability that he will have the disease?

All of the following are true regarding pedigree analysis EXCEPT that it

The human genome contains 46 chromosomes. There are 22 pairs of __________(type of chromosome) and one pair of__________ (type of chromosome).

A(n)__________ is a portion of DNA that resides at a particular locus or site on a chromosome and encodes a particular function.

The physical manifestation of an organismʹs genes is its

Describe where in the process of meiosis independent assortment of genes occurs.

If an individual who is homozygous for type B blood marries a heterozygous type A individual, what is the chance that their first child will have type AB blood?

What are the possible gamete genotypes of an organism that has the genotype HhTt if the two genes are located on separate chromosomes and therefore not linked?

A child is born with dwarfism (tt). His parents are of normal height. Which of the following must be TRUE of the parents?

An Introduction to Life on Earth

Atoms, Molecules, and Life

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

Cellular Reproduction

Meiosis: the Basis of Sexual Reproduction

DNA: The Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amid Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity Ii: Vertebrates

Animal Behavior

Population Growth and Regulation

Community Interactions

Energy Flow and Nutrient Cycling in Ecosystems

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

Plant Responses to the Environment

Filters

The human genome contains 46 chromosomes. There are 22 pairs of (type of chromosome) and one pair of (type of chromosome).