Question 1

According to the law of segregation

Accepted Answer

A)  there is an independent assortment of nonhomologous chromosomes during meiosis. 
B)  each individual carries a single copy of each "factor." 
C)  pairs of alleles fuse during the formation of gametes. 
D)  the sex chromosomes of males and females differ. 
E)  pairs of alleles on homologous chromosomes separate during the formation of gametes. 
A)  there is an independent assortment of nonhomologous chromosomes during meiosis. 
B)  each individual carries a single copy of each "factor." 
C)  pairs of alleles fuse during the formation of gametes. 
D)  the sex chromosomes of males and females differ. 
E)  pairs of alleles on homologous chromosomes separate during the formation of gametes.

Question 2

A Mendelian test cross is used to determine whether

Accepted Answer

A)  an allele is dominant or recessive. 
B)  the flowers are purple or white. 
C)  an individual is homozygous or heterozygous. 
D)  segregation or independent assortment is occurring. 
E)  the genotype or phenotype is more important. 
A)  an allele is dominant or recessive. 
B)  the flowers are purple or white. 
C)  an individual is homozygous or heterozygous. 
D)  segregation or independent assortment is occurring. 
E)  the genotype or phenotype is more important.

Question 3

Round pea shape (R) is dominant over wrinkled pea shape (r). If a round pea has a wrinkled parent, the round pea is

Accepted Answer

A)  RR. 
B)  rr. 
C)  haploid. 
D)  Rr. 
E)  recessive. 
A)  RR. 
B)  rr. 
C)  haploid. 
D)  Rr. 
E)  recessive.

Question 4

A recessive allele is one

Accepted Answer

A)  whose effect is masked when paired with a dominant allele. 
B)  that produces no effect when present in the homozygous condition. 
C)  that must be lethal in the homozygous condition. 
D)  that appears only in a heterozygote. 
E)  that is not expressed as strongly as a dominant allele. 
A)  whose effect is masked when paired with a dominant allele. 
B)  that produces no effect when present in the homozygous condition. 
C)  that must be lethal in the homozygous condition. 
D)  that appears only in a heterozygote. 
E)  that is not expressed as strongly as a dominant allele.

Question 5

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

Question 6

Mendel's law of segregation states that

Accepted Answer

A)  there may be alternative forms of the same gene. 
B)  genes in the same chromosome must stay together. 
C)  genes end up in their respective gametes by chance. 
D)  members of a pair of alleles on homologous chromosomes move away from each other during gamete formation. 
E)  each gamete receives a full complement of chromosomes. 
A)  there may be alternative forms of the same gene. 
B)  genes in the same chromosome must stay together. 
C)  genes end up in their respective gametes by chance. 
D)  members of a pair of alleles on homologous chromosomes move away from each other during gamete formation. 
E)  each gamete receives a full complement of chromosomes.

Question 7

A pea plant with red flowers is test crossed; half of the resulting progeny have red flowers, whereas the other half have white flowers. The genotype of the test- crossed parent was

Accepted Answer

A)  either RR or Rr. 
B)  Rr. 
C)  rr. 
D)  RR. 
A)  either RR or Rr. 
B)  Rr. 
C)  rr. 
D)  RR.

Question 8

The wavy hair in children of straight- haired and curly- haired parents results from a pattern of inheritance called .

Accepted Answer

incomplete

Question 9

Based on this pedigree, which individual was a carrier for hemophilia but did not suffer from the disease?

Accepted Answer

A)  Gonzalo (generation V) 
B)  Alexandra of Denmark (generation III) 
C)  Frederick (generation IV) 
D)  Victoria, Princess of Saxe- Coburg (generation I) 
E)  Irene (generation IV) 
A)  Gonzalo (generation V) 
B)  Alexandra of Denmark (generation III) 
C)  Frederick (generation IV) 
D)  Victoria, Princess of Saxe- Coburg (generation I) 
E)  Irene (generation IV)

Question 10

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

Accepted Answer

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

Question 11

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

Question 12

Which disorder is the most common chromosome anomaly among newborns?

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 13

When the two gametes that fuse to form a zygote contain different alleles of a given gene, the offspring is

Accepted Answer

A)  heterozygous. 
B)  abnormal. 
C)  a new species. 
D)  haploid. 
E)  homozygous. 
A)  heterozygous. 
B)  abnormal. 
C)  a new species. 
D)  haploid. 
E)  homozygous.

Question 14

According to the law of segregation, in an organism with the genotype Aa

Accepted Answer

A)  all of the gametes get the A allele. 
B)  three- quarters of the gametes get the A allele and one- quarter get the a allele. 
C)  all of the gametes get the a allele. 
D)  one- quarter of the gametes get the A allele and three- quarters get the a allele. 
E)  one- half of the gametes get the A allele and one- half get the a allele. 
A)  all of the gametes get the A allele. 
B)  three- quarters of the gametes get the A allele and one- quarter get the a allele. 
C)  all of the gametes get the a allele. 
D)  one- quarter of the gametes get the A allele and three- quarters get the a allele. 
E)  one- half of the gametes get the A allele and one- half get the a allele.

Question 15

What pattern of inheritance "breaks the law" of independent assortment?

Accepted Answer

Alleles that are close togethe

Question 16

What is the genotype of a dominant individual if, when selfed, some of its offspring show the recessive phenotype?

Accepted Answer

A)  DD 
B)  Either DD or Dd 
C)  Dd 
D)  dd 
A)  DD 
B)  Either DD or Dd 
C)  Dd 
D)  dd

Question 17

All of the following combinations are possible in the gametes of an organism that is AaBb EXCEPT

Accepted Answer

A)  AB. 
B)  ab. 
C)  aa. 
D)  aB. 
E)  Ab. 
A)  AB. 
B)  ab. 
C)  aa. 
D)  aB. 
E)  Ab.

Question 18

Females always inherit sex- linked traits from their mothers.

Accepted Answer

A) True 
 B)False

Exam 11: Patterns of Inheritance

According to the law of segregation

A Mendelian test cross is used to determine whether

Round pea shape (R) is dominant over wrinkled pea shape (r). If a round pea has a wrinkled parent, the round pea is

A recessive allele is one

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?

Mendel's law of segregation states that

A pea plant with red flowers is test crossed; half of the resulting progeny have red flowers, whereas the other half have white flowers. The genotype of the test- crossed parent was

The wavy hair in children of straight- haired and curly- haired parents results from a pattern of inheritance called .

Based on this pedigree, which individual was a carrier for hemophilia but did not suffer from the disease?

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

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

Which disorder is the most common chromosome anomaly among newborns?

When the two gametes that fuse to form a zygote contain different alleles of a given gene, the offspring is

According to the law of segregation, in an organism with the genotype Aa

What pattern of inheritance "breaks the law" of independent assortment?

What is the genotype of a dominant individual if, when selfed, some of its offspring show the recessive phenotype?

All of the following combinations are possible in the gametes of an organism that is AaBb EXCEPT

Females always inherit sex- linked traits from their mothers.

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

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