Question 1

What is the difference between phenotype and genotype?

Accepted Answer

A)  Phenotype is when both alleles are the same and genotype is when the alleles are different. 
B)  Genotype is the physical expression of a trait and phenotype is the combination of alleles carried by the organism. 
C)  Phenotype is the physical expression of a trait and genotype is the combination of alleles carried by the organism. 
D)  Phenotype is the alleles that are hidden and genotype is the alleles that are expressed. 
A)  Phenotype is when both alleles are the same and genotype is when the alleles are different. 
B)  Genotype is the physical expression of a trait and phenotype is the combination of alleles carried by the organism. 
C)  Phenotype is the physical expression of a trait and genotype is the combination of alleles carried by the organism. 
D)  Phenotype is the alleles that are hidden and genotype is the alleles that are expressed. C

Question 2

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

Question 3

If we cross two pea plants, each heterozygous for yellow seed color genes, the expected ratio of yellow:green among the offspring will be

Accepted Answer

A)  25% yellow:75% green. 
B)  50% yellow:50% green. 
C)  100% yellow. 
D)  100% green. 
E)  75% yellow:25% green. 
A)  25% yellow:75% green. 
B)  50% yellow:50% green. 
C)  100% yellow. 
D)  100% green. 
E)  75% yellow:25% green. E

Question 4

If the allele for inflated pea pods (I) is dominant to the allele for constricted pods (i), then the cross Ii xii is expected to produce

Accepted Answer

A)  half with inflated and half with constricted pods. 
B)  3/4 with inflated and 1/4 with constricted pods. 
C)  all peas with constricted pods. 
D)  3/4 with constricted and 1/4 with inflated pods. 
E)  all peas with inflated pods. 
A)  half with inflated and half with constricted pods. 
B)  3/4 with inflated and 1/4 with constricted pods. 
C)  all peas with constricted pods. 
D)  3/4 with constricted and 1/4 with inflated pods. 
E)  all peas with inflated pods.

Question 5

A female who is heterozygous for a recessive, sex-linked trait is a(n) __________for that trait.

Accepted Answer

The answer of A female who is heterozygous for a...

Question 6

In a test cross, what percentage of the offspring will have the same phenotype as the tested parent if the parent to be tested is homozygous?

Accepted Answer

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

Question 7

Codominance occurs when

Accepted Answer

A)  offspring exhibit several different phenotypic expressions of a single trait. 
B)  both of the alleles in a heterozygote are equally expressed phenotypically in an individual. 
C)  expression of two different alleles alternates from one generation to the next. 
D)  a heterozygote expresses an intermediate phenotype. 
A)  offspring exhibit several different phenotypic expressions of a single trait. 
B)  both of the alleles in a heterozygote are equally expressed phenotypically in an individual. 
C)  expression of two different alleles alternates from one generation to the next. 
D)  a heterozygote expresses an intermediate phenotype.

Question 8

A woman with blood type AB and a man with blood type O have three children, one of whom is adopted. The blood types of the children are A, B, and O. What is the blood type of the adopted child?

Accepted Answer

A)  A 
B)  O 
C)  B 
D)  Not enough information is provided to answer this question. 
A)  A 
B)  O 
C)  B 
D)  Not enough information is provided to answer this question.

Question 9

For independent assortment of alleles for two different genes to occur, where must the genes be located?

Accepted Answer

The genes

Question 10

If two parents are carriers of albinism (an autosomal recessive trait), what is the chance that their fourth child will have a homozygous dominant genotype?

Accepted Answer

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

Question 11

A disorder caused by nondisjunction of chromosome 21, resulting in a trisomy 21 child, is

Accepted Answer

A)  color deficiency. 
B)  Down syndrome. 
C)  cystic fibrosis. 
D)  hemophilia. 
A)  color deficiency. 
B)  Down syndrome. 
C)  cystic fibrosis. 
D)  hemophilia.

Question 12

Two parents with normal vision have two sons, one color deficient and one with normal vision. If this couple then has six daughters, can you predict what percentage of the daughters will have normal color vision?

Accepted Answer

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

Question 13

When Mendel used true-breeding white flowers and true-breeding purple flowers as the parental generation, what were the results? (Purple flower is dominant over white.)

Accepted Answer

A)  Three-quarters of the flowers produced were white and one-quarter were purple. 
B)  All of the offspring had purple flowers. 
C)  All of the offspring had white flowers. 
D)  One-half of the flowers produced were white and one-half were purple. 
E)  Three-quarters of the flowers produced were purple and one-quarter were white. 
A)  Three-quarters of the flowers produced were white and one-quarter were purple. 
B)  All of the offspring had purple flowers. 
C)  All of the offspring had white flowers. 
D)  One-half of the flowers produced were white and one-half were purple. 
E)  Three-quarters of the flowers produced were purple and one-quarter were white.

Question 14

The location of a gene on a chromosome is called a(n)__________ .

Accepted Answer

The answer of The location of a gene on a...

Question 15

Which of the following statements about genotypes and phenotypes is TRUE?

Accepted Answer

A)  Matings between individuals with recessive phenotypes produce offspring with dominant phenotypes. 
B)  Individuals with the same phenotype might have different genotypes. 
C)  Individuals with the same genotype might have different phenotypes. 
D)  Matings between individuals with dominant phenotypes cannot produce offspring with recessive phenotypes. 
A)  Matings between individuals with recessive phenotypes produce offspring with dominant phenotypes. 
B)  Individuals with the same phenotype might have different genotypes. 
C)  Individuals with the same genotype might have different phenotypes. 
D)  Matings between individuals with dominant phenotypes cannot produce offspring with recessive phenotypes.

Question 16

What is the reason for the prevalence of the sickle-cell allele in African populations?

Accepted Answer

A)  Sickled cells are better able to clot blood. 
B)  African populations tend to be at higher altitudes, and sickled cells better bind oxygen in these environments. 
C)  Heterozygotes have some resistance to the parasite that causes malaria. 
D)  Sickled cells help prevent vitamin A deficiency among African populations. 
A)  Sickled cells are better able to clot blood. 
B)  African populations tend to be at higher altitudes, and sickled cells better bind oxygen in these environments. 
C)  Heterozygotes have some resistance to the parasite that causes malaria. 
D)  Sickled cells help prevent vitamin A deficiency among African populations.

Question 17

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

Accepted Answer

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

Question 18

In human blood types, the alleles for A and B are said to be__________ both expressed equally if present in an individual.

Accepted Answer

The answer of In human blood types, the alleles for...

Question 19

Which disorder is characterized by the individual having a normal number of sex chromosomes?

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 20

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

Accepted Answer

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

Exam 11: Patterns of Inheritance

What is the difference between phenotype and genotype?

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

If we cross two pea plants, each heterozygous for yellow seed color genes, the expected ratio of yellow:green among the offspring will be

If the allele for inflated pea pods (I) is dominant to the allele for constricted pods (i), then the cross Ii xii is expected to produce

A female who is heterozygous for a recessive, sex-linked trait is a(n) __________for that trait.

In a test cross, what percentage of the offspring will have the same phenotype as the tested parent if the parent to be tested is homozygous?

Codominance occurs when

A woman with blood type AB and a man with blood type O have three children, one of whom is adopted. The blood types of the children are A, B, and O. What is the blood type of the adopted child?

For independent assortment of alleles for two different genes to occur, where must the genes be located?

If two parents are carriers of albinism (an autosomal recessive trait), what is the chance that their fourth child will have a homozygous dominant genotype?

A disorder caused by nondisjunction of chromosome 21, resulting in a trisomy 21 child, is

Two parents with normal vision have two sons, one color deficient and one with normal vision. If this couple then has six daughters, can you predict what percentage of the daughters will have normal color vision?

When Mendel used true-breeding white flowers and true-breeding purple flowers as the parental generation, what were the results? (Purple flower is dominant over white.)

The location of a gene on a chromosome is called a(n)__________ .

Which of the following statements about genotypes and phenotypes is TRUE?

What is the reason for the prevalence of the sickle-cell allele in African populations?

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

In human blood types, the alleles for A and B are said to be__________ both expressed equally if present in an individual.

Which disorder is characterized by the individual having a normal number of sex chromosomes?

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

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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