Question 1

A man with blood type O would not be able to father a child with

Accepted Answer

A)  blood type A. 
B)  blood type B. 
C)  blood type AB. 
D)  blood type O. 
E)  any blood type. 
A)  blood type A. 
B)  blood type B. 
C)  blood type AB. 
D)  blood type O. 
E)  any blood type. C

Question 2

Two parents with widow's peak and short fingers have a child with a continuous hairline and long fingers. What are the genotypes of the two parents? (W = widow's peak; S = short fingers)

Accepted Answer

A)  WWSS × wwss 
B)  wwss × WWSS 
C)  WWss × WWss 
D)  WwSs × WwSs 
E)  WwSs × wwss 
A)  WWSS × wwss 
B)  wwss × WWSS 
C)  WWss × WWss 
D)  WwSs × WwSs 
E)  WwSs × wwss D

Question 3

If the genotype of an organism is YySsTt, then yST would represent

Accepted Answer

A)  the genotype of the offspring. 
B)  a possible phenotype of the offspring. 
C)  a gamete of the parent. 
D)  a possible zygote. 
E)  the P generation. 
A)  the genotype of the offspring. 
B)  a possible phenotype of the offspring. 
C)  a gamete of the parent. 
D)  a possible zygote. 
E)  the P generation. C

Question 4

Traits that are controlled by several sets or pairs of alleles, such as skin color and height in humans, are the result of what form of inheritance?

Accepted Answer

A)  polygenic 
B)  incomplete dominance 
C)  multiple allele systems 
D)  simple Mendelian inheritance 
E)  codominance 
A)  polygenic 
B)  incomplete dominance 
C)  multiple allele systems 
D)  simple Mendelian inheritance 
E)  codominance

Question 5

In a testcross, an organism with a dominant phenotype, but unknown genotype, is crossed with an organism that is

Accepted Answer

A)  homozygous dominant. 
B)  heterozygous. 
C)  homozygous recessive. 
D)  heterozygous dominant. 
E)  monohybrid dominant. 
A)  homozygous dominant. 
B)  heterozygous. 
C)  homozygous recessive. 
D)  heterozygous dominant. 
E)  monohybrid dominant.

Question 6

In peas, the yellow seed color is dominant (YY or Yy) over the green seed color (yy). You have been given a plant that only produces yellow seeds and need to determine if the plant is YY or Yy. Which of the following crosses would be most effective for determining the genotype of your plant?

Accepted Answer

A)  your plant × a plant that produces only green seeds 
B)  your plant × another plant with known genotype YY 
C)  your plant × another plant with known genotype Yy 
D)  No cross is necessary. You should just plant your yellow seed and see what color flowers it produces. 
E)  There is no way to determine the genotype of your plant. 
A)  your plant × a plant that produces only green seeds 
B)  your plant × another plant with known genotype YY 
C)  your plant × another plant with known genotype Yy 
D)  No cross is necessary. You should just plant your yellow seed and see what color flowers it produces. 
E)  There is no way to determine the genotype of your plant.

Question 7

Mr. X has been accused by Miss Z of fathering her child. The child's blood type is AB and Miss Z's blood type is A. Which blood type(s) would eliminate Mr. X as a possible father of the child?

Accepted Answer

A)  only A 
B)  only B 
C)  AB 
D)  only O 
E)  either A or O 
A)  only A 
B)  only B 
C)  AB 
D)  only O 
E)  either A or O

Question 8

If the probability in any pregnancy of having a boy is 50%, then what is the probability of having 3 boys in a row?

Accepted Answer

A)  3/4 
B)  1/4 
C)  1/8 
D)  1/2 
E)  3/16 
A)  3/4 
B)  1/4 
C)  1/8 
D)  1/2 
E)  3/16

Question 9

When crossing organisms with differing genotypes, you can expect your actual results to match the predicted results 100% of the time.

Accepted Answer

A) True 
 B)False

Question 10

What pattern of inheritance is shown in the following pedigree? What is the probability that the affected son in generation III will pass the trait on to his children?

Accepted Answer

A)  autosomal recessive; 25% 
B)  autosomal recessive; 50% 
C)  autosomal dominant; 25% 
D)  autosomal dominant; 50% 
E)  autosomal dominant; 100% 
A)  autosomal recessive; 25% 
B)  autosomal recessive; 50% 
C)  autosomal dominant; 25% 
D)  autosomal dominant; 50% 
E)  autosomal dominant; 100%

Question 11

In which kind of monohybrid cross would you expect to find a phenotypic ratio of 3:1 among the offspring?

Accepted Answer

A)  heterozygous × heterozygous 
B)  homozygous recessive × homozygous recessive 
C)  homozygous dominant × homozygous dominant 
D)  homozygous recessive × homozygous dominant 
E)  homozygous dominant × heterozygous 
A)  heterozygous × heterozygous 
B)  homozygous recessive × homozygous recessive 
C)  homozygous dominant × homozygous dominant 
D)  homozygous recessive × homozygous dominant 
E)  homozygous dominant × heterozygous

Question 12

In humans, aniridia, a type of blindness, is due to a dominant allele A. Migraine headaches are due to another dominant allele M. If a man who suffers from both conditions (AaMm) marries a woman who suffers from both (AaMm), what are the chances of an offspring expressing both traits?

Accepted Answer

A)  9/16 
B)  3/16 
C)  1/2 
D)  1/16 
E)  4/16 
A)  9/16 
B)  3/16 
C)  1/2 
D)  1/16 
E)  4/16

Question 13

If T = tall and t = short in plants, the genotype of a short plant would be

Accepted Answer

A)  either TT or Tt. 
B)  either Tt or tt. 
C)  only TT. 
D)  only tt. 
E)  TT, Tt, or tt. 
A)  either TT or Tt. 
B)  either Tt or tt. 
C)  only TT. 
D)  only tt. 
E)  TT, Tt, or tt.

Question 14

How many alleles are required to express a monohybrid trait?

Accepted Answer

A)  2 
B)  1 
C)  3 
D)  5 
E)  4 
A)  2 
B)  1 
C)  3 
D)  5 
E)  4

Question 15

Huntington disease is an autosomal dominant disorder that leads to progressive degeneration of brain cells. There is no effective treatment for the disorder and individuals usually die in their 40s or 50s, 10 to 15 years after the onset of symptoms. Which of these statements about Huntington disease is true?

Accepted Answer

A)  As an autosomal dominant disease, Huntington disease is expressed only if both parents carry the trait. 
B)  Huntington disease usually skips a generation. 
C)  Researchers have located the gene for Huntington disease on chromosome 9. 
D)  Huntington disease usually appears during the teenage years. 
E)  Huntington disease is caused by a mutated copy of the gene for a protein called huntingtin. 
A)  As an autosomal dominant disease, Huntington disease is expressed only if both parents carry the trait. 
B)  Huntington disease usually skips a generation. 
C)  Researchers have located the gene for Huntington disease on chromosome 9. 
D)  Huntington disease usually appears during the teenage years. 
E)  Huntington disease is caused by a mutated copy of the gene for a protein called huntingtin.

Question 16

In humans, an individual who has wavy hair is a heterozygote with one curly hair allele and one straight hair allele. Indicate the phenotypic and genotypic ratios expected for the offspring from a straight-haired man and a wavy-haired woman.

Accepted Answer

Straight and curly hair are incompletely

Question 17

The ability to roll the edges of the tongue upward in a U-shape is inherited as a dominant allele at a single gene locus. Which of the following genotypes would produce an individual that can roll their tongue?

Accepted Answer

A)  TT only 
B)  Tt only 
C)  tt only 
D)  TT or Tt 
E)  Tt or tt 
A)  TT only 
B)  Tt only 
C)  tt only 
D)  TT or Tt 
E)  Tt or tt

Question 18

In the determination of eye color, the HERC2 gene overrides the instructions of the OCA2 gene. If individuals are homozygous for a recessive allele of HERC2, they will have blue eyes regardless of the genotype associated with OCA2. This is an example of

Accepted Answer

A)  epistatic interactions. 
B)  a two-trait cross. 
C)  incomplete dominance. 
D)  codominance. 
E)  homologous chromosomes. 
A)  epistatic interactions. 
B)  a two-trait cross. 
C)  incomplete dominance. 
D)  codominance. 
E)  homologous chromosomes.

Question 19

Given that curly hair (WW) and straight hair (ww) exhibit incomplete dominance, what are the chances that two individuals with wavy hair will have a curly-haired child?

Accepted Answer

A)  none 
B)  25% 
C)  50% 
D)  75% 
E)  100% 
A)  none 
B)  25% 
C)  50% 
D)  75% 
E)  100%

Question 20

Two parents heterozygous for cystic fibrosis have a child with the disease. The parents are expecting a second child. What is the probability that the second child will also have cystic fibrosis?

Accepted Answer

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

Exam 23: Patterns of Gene Inheritance

A man with blood type O would not be able to father a child with

Two parents with widow's peak and short fingers have a child with a continuous hairline and long fingers. What are the genotypes of the two parents? (W = widow's peak; S = short fingers)

If the genotype of an organism is YySsTt, then yST would represent

Traits that are controlled by several sets or pairs of alleles, such as skin color and height in humans, are the result of what form of inheritance?

In a testcross, an organism with a dominant phenotype, but unknown genotype, is crossed with an organism that is

In peas, the yellow seed color is dominant (YY or Yy) over the green seed color (yy). You have been given a plant that only produces yellow seeds and need to determine if the plant is YY or Yy. Which of the following crosses would be most effective for determining the genotype of your plant?

Mr. X has been accused by Miss Z of fathering her child. The child's blood type is AB and Miss Z's blood type is A. Which blood type(s) would eliminate Mr. X as a possible father of the child?

If the probability in any pregnancy of having a boy is 50%, then what is the probability of having 3 boys in a row?

When crossing organisms with differing genotypes, you can expect your actual results to match the predicted results 100% of the time.

What pattern of inheritance is shown in the following pedigree? What is the probability that the affected son in generation III will pass the trait on to his children?

In which kind of monohybrid cross would you expect to find a phenotypic ratio of 3:1 among the offspring?

In humans, aniridia, a type of blindness, is due to a dominant allele A. Migraine headaches are due to another dominant allele M. If a man who suffers from both conditions (AaMm) marries a woman who suffers from both (AaMm), what are the chances of an offspring expressing both traits?

If T = tall and t = short in plants, the genotype of a short plant would be

How many alleles are required to express a monohybrid trait?

In humans, an individual who has wavy hair is a heterozygote with one curly hair allele and one straight hair allele. Indicate the phenotypic and genotypic ratios expected for the offspring from a straight-haired man and a wavy-haired woman.

The ability to roll the edges of the tongue upward in a U-shape is inherited as a dominant allele at a single gene locus. Which of the following genotypes would produce an individual that can roll their tongue?

In the determination of eye color, the HERC2 gene overrides the instructions of the OCA2 gene. If individuals are homozygous for a recessive allele of HERC2, they will have blue eyes regardless of the genotype associated with OCA2. This is an example of

Given that curly hair (WW) and straight hair (ww) exhibit incomplete dominance, what are the chances that two individuals with wavy hair will have a curly-haired child?

Two parents heterozygous for cystic fibrosis have a child with the disease. The parents are expecting a second child. What is the probability that the second child will also have cystic fibrosis?

The Study of Life

The Molecules of Cells

Cell Structure and Function

Membrane Structure and Function

Cell Division

Metabolism: Energy and Enzymes

Cellular Respiration

Photosynthesis

Plant Organization and Function

Plant Reproduction and Responses

Human Organization

Cardiovascular System

Lymphatic and Immune Systems

Digestive System and Nutrition

Respiratory System

Urinary System and Excretion

Nervous System

Senses

Musculoskeletal System

Endocrine System

Reproductive System

Development and Aging

Chromosomal Basis of Inheritance

Dna Structure and Gene Expression

Biotechnology and Genomics

Evolution of Life

Microbiology

Protists and Fungi

Plants

Animals: the Invertebrates

Animals: Chordates and Vertebrates

Behavioral Ecology

Population and Community Ecology

Nature of Ecosystems

Major Ecosystems of the Biosphere

Conservation Biology

Filters