Question 1

Autosomal traits that appear only in one gender are

Accepted Answer

A)  sex limited. 
B)  sex influenced. 
C)  sex inhibited. 
D)  sex linked. 
E)  all of the above. 
A)  sex limited. 
B)  sex influenced. 
C)  sex inhibited. 
D)  sex linked. 
E)  all of the above.

Question 2

In chickens, there is a mutant gene called "frizzle" that results in weak, stringy, and easily broken feathers. When a frightfully frizzled fowl is bred to a normal chicken, the offspring are all mildly frizzled. If one breeds two mildly frizzled chickens to each other, the offspring have the phenotypic ratio of 1 normal: 2 mildly frizzled: 1 frightfully frizzled. What is the mode of inheritance of "frizzle?"

Accepted Answer

There are three phenotypes observed in t

Question 3

The death of an organism may be caused by

Accepted Answer

A)  an epistatic allele. 
B)  mutation in an essential gene. 
C)  a lethal allele. 
D)  incomplete penetrance of an allele. 
E)  both B and C. 
A)  an epistatic allele. 
B)  mutation in an essential gene. 
C)  a lethal allele. 
D)  incomplete penetrance of an allele. 
E)  both B and C.

Question 4

In the human ABO blood system, the allele i is dominant to IA and IB.

Accepted Answer

A) True 
 B)False

Question 5

Sex-limited traits are caused by genes that are on sex chromosomes.

Accepted Answer

A) True 
 B)False

Question 6

A and B antigens in human blood are produced by the conversion of ________ by the addition of a sugar group.

Accepted Answer

A)  α-N-acetylgalactosamine 
B)  the Bombay antigen 
C)  anti-A and anti-B antibodies 
D)  anti-O antibodies 
E)  the H antigen 
A)  α-N-acetylgalactosamine 
B)  the Bombay antigen 
C)  anti-A and anti-B antibodies 
D)  anti-O antibodies 
E)  the H antigen

Question 7

Human height is a trait affected by both genes and the environment. How is this so?

Accepted Answer

Human height is directly influenced by a

Question 8

Eye color in Drosophila is a case of incomplete dominance and multiple alleles.

Accepted Answer

A) True 
 B)False

Question 9

The agouti coat color in mice is the result of recessive epistasis, where the F2 phenotypic ratio is

Accepted Answer

A)  9:3:4. 
B)  9:7. 
C)  9:3:3:1. 
D)  3:1. 
E)  9:6:1. 
A)  9:3:4. 
B)  9:7. 
C)  9:3:3:1. 
D)  3:1. 
E)  9:6:1.

Question 10

Comb shape in chickens also involves the interaction of two genes, but the F2 generation shows a typical 9:3:3:1 Mendelian ratio. How does this work?

Accepted Answer

A dominant allele present in one gene in

Question 11

A person with type B blood could receive a transfusion of blood from someone with blood type

Accepted Answer

A)  O. 
B)  AB. 
C)  B. 
D)  Both A and C 
E)  All of the above 
A)  O. 
B)  AB. 
C)  B. 
D)  Both A and C 
E)  All of the above

Question 12

For traits that show incomplete dominance, the phenotype of a heterozygote is

Accepted Answer

A)  the same as the homozygous dominant phenotype. 
B)  completely different from either the homozygous dominant or recessive phenotype. 
C)  the same as the homozygous recessive phenotype. 
D)  a mosaic of the homozygous dominant and the homozygous recessive phenotypes. 
E)  intermediate between the homozygous dominant and the homozygous recessive phenotypes. 
A)  the same as the homozygous dominant phenotype. 
B)  completely different from either the homozygous dominant or recessive phenotype. 
C)  the same as the homozygous recessive phenotype. 
D)  a mosaic of the homozygous dominant and the homozygous recessive phenotypes. 
E)  intermediate between the homozygous dominant and the homozygous recessive phenotypes.

Question 13

Explain and differentiate among the molecular basis for codominance, incomplete dominance, and complete dominance.

Accepted Answer

In codominance, gene product from both a

Question 14

Phenylketonuria is an example of a phenotype that is solely influenced by genes.

Accepted Answer

A) True 
 B)False

Question 15

A cat that is homozygous recessive for the Manx gene has which of the following phenotypes?

Accepted Answer

A)  No tail 
B)  Normal tail 
C)  Dead 
D)  Dark fur at the extremities 
E)  Tortoiseshell coat 
A)  No tail 
B)  Normal tail 
C)  Dead 
D)  Dark fur at the extremities 
E)  Tortoiseshell coat

Question 16

In an interacting gene pair, the gene whose expression is masked by another gene is the ________ gene.

Accepted Answer

A)  homostatic 
B)  limnostatic 
C)  hyperstatic 
D)  hypostatic 
E)  epistatic 
A)  homostatic 
B)  limnostatic 
C)  hyperstatic 
D)  hypostatic 
E)  epistatic

Question 17

The child of a woman who was infected with rubella during pregnancy may show a disorder that mimics a genetic defect. The disorder is known as a

Accepted Answer

A)  environmental disorder. 
B)  novel phenotype. 
C)  phenocopy. 
D)  variably expressed trait. 
E)  phenotype. 
A)  environmental disorder. 
B)  novel phenotype. 
C)  phenocopy. 
D)  variably expressed trait. 
E)  phenotype.

Question 18

Genes that have a wild-type and multiple mutant forms are said to constitute a gene family.

Accepted Answer

A) True 
 B)False

Question 19

For a gene with complete dominance, the recessive allele has no effect on the phenotype of a heterozygote.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following will result in modifications to the expected Mendelian ratios?

Accepted Answer

A)  Incomplete penetrance 
B)  Incomplete dominance 
C)  Epistasis 
D)  Gene interaction 
E)  All of the above 
A)  Incomplete penetrance 
B)  Incomplete dominance 
C)  Epistasis 
D)  Gene interaction 
E)  All of the above

Exam 4: Gene Mapping in Eukaryotes

Autosomal traits that appear only in one gender are

The death of an organism may be caused by

In the human ABO blood system, the allele i is dominant to IA and IB.

Sex-limited traits are caused by genes that are on sex chromosomes.

A and B antigens in human blood are produced by the conversion of ________ by the addition of a sugar group.

Human height is a trait affected by both genes and the environment. How is this so?

Eye color in Drosophila is a case of incomplete dominance and multiple alleles.

The agouti coat color in mice is the result of recessive epistasis, where the F2 phenotypic ratio is

Comb shape in chickens also involves the interaction of two genes, but the F2 generation shows a typical 9:3:3:1 Mendelian ratio. How does this work?

A person with type B blood could receive a transfusion of blood from someone with blood type

For traits that show incomplete dominance, the phenotype of a heterozygote is

Explain and differentiate among the molecular basis for codominance, incomplete dominance, and complete dominance.

Phenylketonuria is an example of a phenotype that is solely influenced by genes.

A cat that is homozygous recessive for the Manx gene has which of the following phenotypes?

In an interacting gene pair, the gene whose expression is masked by another gene is the ________ gene.

The child of a woman who was infected with rubella during pregnancy may show a disorder that mimics a genetic defect. The disorder is known as a

Genes that have a wild-type and multiple mutant forms are said to constitute a gene family.

For a gene with complete dominance, the recessive allele has no effect on the phenotype of a heterozygote.

Which of the following will result in modifications to the expected Mendelian ratios?

Genetics of Bacteria and Bacteriophages

Variations in Chromosome Structure and Number

Advanced Gene Mapping in Eukaryotes

Quantitative Genetics

Extensions of Mendelian Genetic Principles

Chromosomal Basis of Inheritance

Molecular Evolution

Population Genetics

Non-Mendelian Inheritance

Genetics of Cancer

Genetic Analysis of Development

Regulation of Gene Expression in Eukaryotes

Mendelian Genetics

Regulation of Gene Expression in Bacteria and Bacteriophages

Genomics

Applications of Recombinant DNA Technology

Recombinant DNA Technology

DNA Mutation, DNA Repair, and Transposable Elements

Gene Expression: Translation

Gene Expression: Transcription

Gene Control of Proteins

DNA Replication

DNA: The Genetic Material

Genetics: an Introduction

Filters