Question 1

There is no limit to the number of alleles that exist for a gene.

Accepted Answer

A) True 
 B)False  True

Question 2

Suppose that your father is heterozygous for sickle cell disease. Suppose also that you know your mom has two "good" alleles. What is the probability that you will have the disorder and/or carry the "bad" allele and be able to pass it on to your children?

Accepted Answer

A) 25% for you, and 25% for your children 
B) 0% for you, and a possibility of passing it on to your children 
C) 0% for you, and you do not need to worry about passing the "bad" allele on to your children 
D) 50% for you, and 50% for your children 
A) 25% for you, and 25% for your children 
B) 0% for you, and a possibility of passing it on to your children 
C) 0% for you, and you do not need to worry about passing the "bad" allele on to your children 
D) 50% for you, and 50% for your children B

Question 3

Human blood types follow which of the following inheritance patterns?

Accepted Answer

A) dominance and codominance 
B) dominance and incomplete dominance 
C) codominance 
D) incomplete dominance 
A) dominance and codominance 
B) dominance and incomplete dominance 
C) codominance 
D) incomplete dominance A

Question 4

Suppose that a patient presents the following symptoms: anemia, dilation of heart, lung damage and pneumonia, rheumatism, abdominal pain, and kidney failure. After learning about the patient's family history, which disorder did the doctor run a genetic test for?

Accepted Answer

A) cystic fibrosis 
B) albinism 
C) sickle cell disease 
D) achondroplasia 
A) cystic fibrosis 
B) albinism 
C) sickle cell disease 
D) achondroplasia

Question 5

Suppose that a pink snapdragon (CRCW) is crossed with a white snapdragon (CWCW). What percentage of the progeny will be red?

Accepted Answer

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

Question 6

Which sentence describes the principle of independent assortment?

Accepted Answer

A) Genes on the same chromosome are always inherited together. 
B) Two alleles for a single trait are randomly sorted to individual gametes; chromosomes are not mentioned. 
C) Alleles on different homologous chromosomes are not randomly sorted to individual gametes. 
D) Genes on the same chromosome are not randomly sorted to different gametes. 
A) Genes on the same chromosome are always inherited together. 
B) Two alleles for a single trait are randomly sorted to individual gametes; chromosomes are not mentioned. 
C) Alleles on different homologous chromosomes are not randomly sorted to individual gametes. 
D) Genes on the same chromosome are not randomly sorted to different gametes.

Question 7

Suppose the probability of X occurring is 1 in 4, and the probability of Y occurring is 1 in 5. What is the probability of both occurring?

Accepted Answer

A) (1/4) + (1/5) = (5/20) + (4/20) = 9/20 
B) (1/4)2 + (1/5)2 = (1/16) + (1/25) = (25/400) + (16/400) = 41/400 
C) (1/4)(1/5) = 1/20 
D) (1/4)2(1/5)2 = (1/16)(1/25) = 1/400 
A) (1/4) + (1/5) = (5/20) + (4/20) = 9/20 
B) (1/4)2 + (1/5)2 = (1/16) + (1/25) = (25/400) + (16/400) = 41/400 
C) (1/4)(1/5) = 1/20 
D) (1/4)2(1/5)2 = (1/16)(1/25) = 1/400

Question 8

Suppose that both of your parents have Huntington's disease, which is caused by a dominant allele, and are both heterozygous for the disease. What are the odds of you having the disorder?

Accepted Answer

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

Question 9

Which of the following phenotypic ratios would be expected to result from a dihybrid cross?

Accepted Answer

A) 9:3:1 
B) 9:3:3:1 
C) 9:3:4 
D) 3:1 
A) 9:3:1 
B) 9:3:3:1 
C) 9:3:4 
D) 3:1

Question 10

Which of the following shows an F1 monohybrid cross?

Accepted Answer

A) Rr ⋅ Rr 
B) RRMM ⋅ rrmm 
C) rr ⋅ RR 
D) RrMM ⋅ Rrmm 
A) Rr ⋅ Rr 
B) RRMM ⋅ rrmm 
C) rr ⋅ RR 
D) RrMM ⋅ Rrmm

Question 11

A testcross always uses a homozygous recessive organism as one parent.

Accepted Answer

A) True 
 B)False

Question 12

Match the examples listed below to the following five types of allele interactions.
-Labrador retrievers have three colours of fur due to this allele interaction.

Accepted Answer

A) dominance 
B) incomplete dominance 
C) codominance 
D) epistasis 
E) polygenic inheritance 
A) dominance 
B) incomplete dominance 
C) codominance 
D) epistasis 
E) polygenic inheritance

Question 13

Which of the following is a result of an incomplete dominance?

Accepted Answer

A) orange carnations 
B) white carnations 
C) pink carnations 
D) red carnations 
A) orange carnations 
B) white carnations 
C) pink carnations 
D) red carnations

Question 14

Snapdragons have incomplete dominance of the red and white alleles. What will be the phenotypes and ratios of the F2 generation?

Accepted Answer

A) 50% white, 50% red 
B) 25% white, 25% red, 50% pink 
C) 100% pink 
D) 100% red 
A) 50% white, 50% red 
B) 25% white, 25% red, 50% pink 
C) 100% pink 
D) 100% red

Question 15

Suppose that your mother and father are both healthy but carry the allele for cystic fibrosis, which is caused by a recessive allele. What are the odds of you having at least one allele for the disorder?

Accepted Answer

A) 1 in 4 
B) 1 in 2 
C) 3 in 4 
D) 1 
A) 1 in 4 
B) 1 in 2 
C) 3 in 4 
D) 1

Question 16

Match each term with its correct definition.
-dominant

Accepted Answer

A) displayed traits are unchanged over multiple generations 
B) first generation of offspring from a parental cross 
C) true-breeding organisms used in the initial cross 
D) result of a cross between two first-generation organisms 
E) allele that is expressed no matter what other allele is present
F)allele that is expressed only if two identical copies are present
G)any organism with two identical copies of an allele
H)any organism with two different forms of an allele
I)F1 heterozygote (for a single trait)
J)genetic makeup of an organism
K)physical traits of an organism
L)likelihood of something occurring if the occurrence is a matter of chance
M)organism that is heterozygous for two different traits
N)where an allele is found on a chromosome
O)when one allele cannot completely mask the effects of another allele
P)alleles at one locus mask the expression of alleles at a different locus
Q)several different genes contribute to a particular phenotype
R)single allele has multiple phenotypic effects 
A) displayed traits are unchanged over multiple generations 
B) first generation of offspring from a parental cross 
C) true-breeding organisms used in the initial cross 
D) result of a cross between two first-generation organisms 
E) allele that is expressed no matter what other allele is present
F)allele that is expressed only if two identical copies are present
G)any organism with two identical copies of an allele
H)any organism with two different forms of an allele
I)F1 heterozygote (for a single trait)
J)genetic makeup of an organism
K)physical traits of an organism
L)likelihood of something occurring if the occurrence is a matter of chance
M)organism that is heterozygous for two different traits
N)where an allele is found on a chromosome
O)when one allele cannot completely mask the effects of another allele
P)alleles at one locus mask the expression of alleles at a different locus
Q)several different genes contribute to a particular phenotype
R)single allele has multiple phenotypic effects

Question 17

Mendel selected seven traits in pea plants to study. Why were his results relatively easy to interpret, even though he was examining seven distinct traits?

Accepted Answer

A) All seven traits were easy to characterize. 
B) The seven alleles segregated independently from each other. 
C) Peas are easy to raise and have short life cycles. 
D) He knew enough mathematics to apply rules of probability to his results. 
A) All seven traits were easy to characterize. 
B) The seven alleles segregated independently from each other. 
C) Peas are easy to raise and have short life cycles. 
D) He knew enough mathematics to apply rules of probability to his results.

Question 18

Match each term with its correct definition.
-P generation

Accepted Answer

A) displayed traits are unchanged over multiple generations 
B) first generation of offspring from a parental cross 
C) true-breeding organisms used in the initial cross 
D) result of a cross between two first-generation organisms 
E) allele that is expressed no matter what other allele is present
F)allele that is expressed only if two identical copies are present
G)any organism with two identical copies of an allele
H)any organism with two different forms of an allele
I)F1 heterozygote (for a single trait)
J)genetic makeup of an organism
K)physical traits of an organism
L)likelihood of something occurring if the occurrence is a matter of chance
M)organism that is heterozygous for two different traits
N)where an allele is found on a chromosome
O)when one allele cannot completely mask the effects of another allele
P)alleles at one locus mask the expression of alleles at a different locus
Q)several different genes contribute to a particular phenotype
R)single allele has multiple phenotypic effects 
A) displayed traits are unchanged over multiple generations 
B) first generation of offspring from a parental cross 
C) true-breeding organisms used in the initial cross 
D) result of a cross between two first-generation organisms 
E) allele that is expressed no matter what other allele is present
F)allele that is expressed only if two identical copies are present
G)any organism with two identical copies of an allele
H)any organism with two different forms of an allele
I)F1 heterozygote (for a single trait)
J)genetic makeup of an organism
K)physical traits of an organism
L)likelihood of something occurring if the occurrence is a matter of chance
M)organism that is heterozygous for two different traits
N)where an allele is found on a chromosome
O)when one allele cannot completely mask the effects of another allele
P)alleles at one locus mask the expression of alleles at a different locus
Q)several different genes contribute to a particular phenotype
R)single allele has multiple phenotypic effects

Question 19

Skin colour in humans is caused by polygenic inheritance. Which one of the following statements is implied by this form of inheritance?

Accepted Answer

A) The skin colour of children will always be identical to one parent or the other. 
B) The skin colour of children will always be intermediate to that of their parents. 
C) The skin colour of children will most often be identical to that of one of their parents, but sometimes not. 
D) The skin colour of children will most often be intermediate to that of their parents, but sometimes not. 
A) The skin colour of children will always be identical to one parent or the other. 
B) The skin colour of children will always be intermediate to that of their parents. 
C) The skin colour of children will most often be identical to that of one of their parents, but sometimes not. 
D) The skin colour of children will most often be intermediate to that of their parents, but sometimes not.

Question 20

Suppose that your parents are both heterozygous for sickle cell disease. What is the probability that you will have the disorder?

Accepted Answer

A) 25%, whether or not you have siblings 
B) 50%, whether or not you have siblings 
C) 75%, whether or not you have siblings 
D) 100%, whether or not you have siblings 
A) 25%, whether or not you have siblings 
B) 50%, whether or not you have siblings 
C) 75%, whether or not you have siblings 
D) 100%, whether or not you have siblings

Exam 10: Mendel, Genes, and Inheritance

There is no limit to the number of alleles that exist for a gene.

Suppose that your father is heterozygous for sickle cell disease. Suppose also that you know your mom has two "good" alleles. What is the probability that you will have the disorder and/or carry the "bad" allele and be able to pass it on to your children?

Human blood types follow which of the following inheritance patterns?

Suppose that a patient presents the following symptoms: anemia, dilation of heart, lung damage and pneumonia, rheumatism, abdominal pain, and kidney failure. After learning about the patient's family history, which disorder did the doctor run a genetic test for?

Suppose that a pink snapdragon (CRCW) is crossed with a white snapdragon (CWCW). What percentage of the progeny will be red?

Which sentence describes the principle of independent assortment?

Suppose the probability of X occurring is 1 in 4, and the probability of Y occurring is 1 in 5. What is the probability of both occurring?

Suppose that both of your parents have Huntington's disease, which is caused by a dominant allele, and are both heterozygous for the disease. What are the odds of you having the disorder?

Which of the following phenotypic ratios would be expected to result from a dihybrid cross?

Which of the following shows an F1 monohybrid cross?

A testcross always uses a homozygous recessive organism as one parent.

Match the examples listed below to the following five types of allele interactions. -Labrador retrievers have three colours of fur due to this allele interaction.

Which of the following is a result of an incomplete dominance?

Snapdragons have incomplete dominance of the red and white alleles. What will be the phenotypes and ratios of the F2 generation?

Suppose that your mother and father are both healthy but carry the allele for cystic fibrosis, which is caused by a recessive allele. What are the odds of you having at least one allele for the disorder?

Match each term with its correct definition. -dominant

Mendel selected seven traits in pea plants to study. Why were his results relatively easy to interpret, even though he was examining seven distinct traits?

Match each term with its correct definition. -P generation

Skin colour in humans is caused by polygenic inheritance. Which one of the following statements is implied by this form of inheritance?

Suppose that your parents are both heterozygous for sickle cell disease. What is the probability that you will have the disorder?

Light and Life

The Cell: an Overview

Defining Life and Its Origins

Energy and Enzymes

Cell Membranes and Signalling

Cellular Respiration

Photosynthesis

Cell Cycles

Genetic Recombination

Genes, Chromosomes, and Human Genetics

Dna Structure, Replication, and Organization

Gene Structure and Expression

Control of Gene Expression

Dna Technologies

Genomes and Proteomes

Evolution: the Development of the Theory

Microevolution: Changes Within Populations

Species and Macroevolution

Understanding the History of Life on Earth

Humans and Evolution

Bacteria and Archaea

Viruses, Viroids, and Prions: Infectious Biological Particles

Protists

Fungi

Plants

Diversity of Animals 1: Sponges, Radiata, Platyhelminthes, and Protostomes

Diversity of Animals 2: Deuterostomes: Vertebrates and Their Closest Relatives

Population Ecology

Population Interactions and Community Ecology

Ecosystems

Conservation of Biodiversity

Putting Selection to Work

Organization of the Plant Body

Transport in Plants

Reproduction and Development in Flowering Plants

Plant Nutrition

Plant Signals and Responses to the Environment

Introduction to Animal Organization and Physiology

Transport in Animals: the Circulatory System

Reproduction in Animals

Animal Development

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Integration

Muscles, Skeletons, and Body Movements

Animal Behaviour

Animal Nutrition

Gas Exchange: the Respiratory System

Regulating the Internal Environment

Defences Against Disease

Conservation and Evolutionary Physiology

Filters

Suppose that a pink snapdragon (C^RC^W) is crossed with a white snapdragon (C^WC^W). What percentage of the progeny will be red?

Which of the following shows an F₁ monohybrid cross?

Snapdragons have incomplete dominance of the red and white alleles. What will be the phenotypes and ratios of the F₂ generation?