Question 1

Phenylketonuria in humans is an example of .

Accepted Answer

A)  Incomplete penetrance 
B)  Codominance 
C)  An environmental-influenced trait 
D)  Incomplete dominance 
E)  All of the answers are correct 
A)  Incomplete penetrance 
B)  Codominance 
C)  An environmental-influenced trait 
D)  Incomplete dominance 
E)  All of the answers are correct

Question 2

In rabbits, full coat color (c) is the dominant trait. A second allele, chinchilla (cch) is recessive to full coat color. Himalayan coat color (ch) is recessive to chinchilla and full coat colors and albino (c)
Is recessive to all coat colors. If two chinchilla rabbits mate, what coat color is not possible in their offspring?

Accepted Answer

A)  Full coat color 
B)  Chinchilla coat color 
C)  Himalayan coat color 
D)  Albino coat color 
E)  All coat colors are possible 
A)  Full coat color 
B)  Chinchilla coat color 
C)  Himalayan coat color 
D)  Albino coat color 
E)  All coat colors are possible

Question 3

In human blood groups, the fact that an individual can have an AB blood type is an example of .

Accepted Answer

A)  Incomplete dominance 
B)  Incomplete penetrance 
C)  Sex-influenced trait 
D)  Temperature-sensitive conditional allele 
E)  Codominance 
A)  Incomplete dominance 
B)  Incomplete penetrance 
C)  Sex-influenced trait 
D)  Temperature-sensitive conditional allele 
E)  Codominance

Question 4

A suppressor mutation

Accepted Answer

A)  Can only be found in the same gene 
B)  Can only be found in a separate gene 
C)  Can be found in the same gene or a separate gene 
D)  Cannot be created 
E)  None of the answers are correct 
A)  Can only be found in the same gene 
B)  Can only be found in a separate gene 
C)  Can be found in the same gene or a separate gene 
D)  Cannot be created 
E)  None of the answers are correct

Question 5

Incomplete penetrance indicates that individuals who possess a dominant trait always express the trait.

Accepted Answer

A) True 
 B)False

Question 6

Paralogs are often functionally redundant and can compensate for the loss of either of the paralogs in a
set.

Accepted Answer

A) True 
 B)False

Question 7

The coat characteristics of Siamese cats and Himalayan rabbits, where proteins in the extremities function differently than in other parts of the body is an example of .

Accepted Answer

A)  Incomplete dominance 
B)  Multiple allele systems 
C)  Semilethal alleles 
D)  Temperature-sensitive allele 
E)  None of the answers are correct 
A)  Incomplete dominance 
B)  Multiple allele systems 
C)  Semilethal alleles 
D)  Temperature-sensitive allele 
E)  None of the answers are correct

Question 8

Huntington disease in humans is an example of .

Accepted Answer

A)  Essential genes 
B)  Lethal alleles 
C)  Semilethal alleles 
D)  Nonessential genes 
E)  Conditional lethal alleles 
A)  Essential genes 
B)  Lethal alleles 
C)  Semilethal alleles 
D)  Nonessential genes 
E)  Conditional lethal alleles

Question 9

When wild-type offspring are produced from a cross between parents that both display the same recessive phenotype illustrates the genetic phenomenon of .

Accepted Answer

A)  Simple recessive alleles 
B)  Incomplete penetrance 
C)  Complementation 
D)  Gene dosage 
E)  A spontaneous mutation 
A)  Simple recessive alleles 
B)  Incomplete penetrance 
C)  Complementation 
D)  Gene dosage 
E)  A spontaneous mutation

Question 10

Epistasis is .

Accepted Answer

A)  Another term for over dominance 
B)  When one gene can mask the expression of a second gene 
C)  A trait that is only expressed in one sex of the species 
D)  When two dominant alleles can be expressed in the same individual 
E)  None of the answers are correct 
A)  Another term for over dominance 
B)  When one gene can mask the expression of a second gene 
C)  A trait that is only expressed in one sex of the species 
D)  When two dominant alleles can be expressed in the same individual 
E)  None of the answers are correct

Question 11

In four-o'clock plants, red flower color is dominant to white flower color. However, heterozygous plants have a pink color. If a pink-flowered plant is crossed with a white-flowered plant, what will be the phenotypic ratios of their offspring?

Accepted Answer

A)  ¼ red, ½ pink, ¼ white 
B)  All pink 
C)  All white 
D)  ½ pink, ½ white 
E)  ½ red, ½ pink 
A)  ¼ red, ½ pink, ¼ white 
B)  All pink 
C)  All white 
D)  ½ pink, ½ white 
E)  ½ red, ½ pink

Question 12

Genes that are not required for survival, but are likely to be beneficial to the organism, are called .

Accepted Answer

A)  Essential genes 
B)  Lethal alleles 
C)  Semilethal alleles 
D)  Nonessential genes 
E)  Conditional lethal alleles 
A)  Essential genes 
B)  Lethal alleles 
C)  Semilethal alleles 
D)  Nonessential genes 
E)  Conditional lethal alleles

Question 13

At the molecular level, which of the following best explain heterozygous advantage and over dominance?

Accepted Answer

A)  A heterozygous individual can produce more varieties of homodimer proteins 
B)  The alleles produce two different proteins with slightly different functions 
C)  The proteins produced by the alleles may provide a broader range of environmental tolerance, such as temperature ranges 
D)  Infectious organisms may recognize only a specific functional protein 
E)  All of the answers are possibilities 
A)  A heterozygous individual can produce more varieties of homodimer proteins 
B)  The alleles produce two different proteins with slightly different functions 
C)  The proteins produced by the alleles may provide a broader range of environmental tolerance, such as temperature ranges 
D)  Infectious organisms may recognize only a specific functional protein 
E)  All of the answers are possibilities

Question 14

For a certain trait, a heterozygous individual has a selective advantage than a homozygous dominant or homozygous recessive individual. This is called .

Accepted Answer

A)  Codiminance 
B)  Incomplete dominance 
C)  Over dominance 
D)  Incomplete penetrance 
E)  Multiple allele systems 
A)  Codiminance 
B)  Incomplete dominance 
C)  Over dominance 
D)  Incomplete penetrance 
E)  Multiple allele systems

Question 15

The coat color of rabbits is an example of a(n) .

Accepted Answer

A)  Semilethal allele 
B)  Sex-linked trait 
C)  Multiple allele system 
D)  Incomplete dominance 
A)  Semilethal allele 
B)  Sex-linked trait 
C)  Multiple allele system 
D)  Incomplete dominance

Question 16

If an allele is dominant in one sex and recessive in another, it is an example of .

Accepted Answer

A)  Sex-limited inheritance 
B)  Sex-influenced inheritance 
C)  Incomplete dominance. 
D)  Simple Mendelian inheritance 
E)  Incomplete dominance 
A)  Sex-limited inheritance 
B)  Sex-influenced inheritance 
C)  Incomplete dominance. 
D)  Simple Mendelian inheritance 
E)  Incomplete dominance

Question 17

Human blood groups are determined by antigens on the surface of red blood cells.

Accepted Answer

A) True 
 B)False

Question 18

The trait of cream-colored eyes in Drosophila is an example of .

Accepted Answer

A)  Simple recessive alleles 
B)  Incomplete penetrance of red eyes 
C)  Gene interactions in eye color 
D)  Gene dosage 
E)  A spontaneous mutation 
A)  Simple recessive alleles 
B)  Incomplete penetrance of red eyes 
C)  Gene interactions in eye color 
D)  Gene dosage 
E)  A spontaneous mutation

Question 19

The multiple effects of a single gene on the phenotype of an organism is called .

Accepted Answer

A)  Epistasis 
B)  penetrance 
C)  Expressivity 
D)  Overdominance 
E)  Pleiotropy 
A)  Epistasis 
B)  penetrance 
C)  Expressivity 
D)  Overdominance 
E)  Pleiotropy

Question 20

How did Bateson and Punnett's work with comb morphology in chickens differ from the dihybrid work of Mendel?

Accepted Answer

A)  They were working with sex-limited traits 
B)  Their F2 offspring displayed 4 unique phenotypes, not the four combinations of two phenotypes expected in a Mendelian cross 
C)  ½ of their combinations were lethal 
D)  The expression of their trait varied by the environment in which the chickens were raised 
A)  They were working with sex-limited traits 
B)  Their F2 offspring displayed 4 unique phenotypes, not the four combinations of two phenotypes expected in a Mendelian cross 
C)  ½ of their combinations were lethal 
D)  The expression of their trait varied by the environment in which the chickens were raised

Exam 4: Extensions of Mendelian Inheritance

Phenylketonuria in humans is an example of .

In human blood groups, the fact that an individual can have an AB blood type is an example of .

A suppressor mutation

Incomplete penetrance indicates that individuals who possess a dominant trait always express the trait.

Paralogs are often functionally redundant and can compensate for the loss of either of the paralogs in a set.

The coat characteristics of Siamese cats and Himalayan rabbits, where proteins in the extremities function differently than in other parts of the body is an example of .

Huntington disease in humans is an example of .

When wild-type offspring are produced from a cross between parents that both display the same recessive phenotype illustrates the genetic phenomenon of .

Epistasis is .

In four-o'clock plants, red flower color is dominant to white flower color. However, heterozygous plants have a pink color. If a pink-flowered plant is crossed with a white-flowered plant, what will be the phenotypic ratios of their offspring?

Genes that are not required for survival, but are likely to be beneficial to the organism, are called .

At the molecular level, which of the following best explain heterozygous advantage and over dominance?

For a certain trait, a heterozygous individual has a selective advantage than a homozygous dominant or homozygous recessive individual. This is called .

The coat color of rabbits is an example of a(n) .

If an allele is dominant in one sex and recessive in another, it is an example of .

Human blood groups are determined by antigens on the surface of red blood cells.

The trait of cream-colored eyes in Drosophila is an example of .

The multiple effects of a single gene on the phenotype of an organism is called .

How did Bateson and Punnett's work with comb morphology in chickens differ from the dihybrid work of Mendel?

Overview of Genetics

Mendelian Inheritance

Reproduction and Chromosome Transmission

Non-Mendelian Inheritance

Genetic Linkage and Mapping in Eukaryotes

Genetic Transfer and Mapping in Bacteria and

Variation in Chromosome Structure and Number

Molecular Structure of Dna and Rna

Chromosome Organization and Molecular Structure

Dna Replication

Gene Transcription and Rna Modification

Translation of Mrna

Gene Regulation in Bacteria and Bacteriophages

Gene Regulation in Eukaryotes

Gene Mutation and Dna Repair

Recombination and Transposition at the Molecular

Recombinant Dna Technology

Biotechnology

Genomics I: Analysis of Dna

Genomics II: Functional Genomics, Proteomics, and

Medical Genetics and Cancer

Developmental Genetics

Population Genetics

Quantitative Genetics

Evolutionary Genetics

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