Question 1

An ascus that contains two parental spores and two nonparental spores is called a tetratype.

Accepted Answer

A) True 
 B)False  True

Question 2

In haploid fungi, which of the following is used to calculate the distance between the centromere and the gene of interest?

Accepted Answer

A)  Percent individuals experiencing double-crossover events 
B)  Number of diploid spores 
C)  Spores that have undergone first division segregation 
D)  Spores that have undergone second division segregation 
E)  None of the answers are correct 
A)  Percent individuals experiencing double-crossover events 
B)  Number of diploid spores 
C)  Spores that have undergone first division segregation 
D)  Spores that have undergone second division segregation 
E)  None of the answers are correct D

Question 3

Which of the following is not one of the principles of linkage that Morgan obtained from his experiments?

Accepted Answer

A)  Genes that are on the same chromosome may be inherited together. 
B)  Crossing over exchanges pieces of chromosomes and creates new allele combinations. 
C)  The likelihood of crossing over occurring between two genes is dependent on the distance of the genes from one another. 
D)  Genes that are on the same chromosome are always transmitted together as a unit. 
A)  Genes that are on the same chromosome may be inherited together. 
B)  Crossing over exchanges pieces of chromosomes and creates new allele combinations. 
C)  The likelihood of crossing over occurring between two genes is dependent on the distance of the genes from one another. 
D)  Genes that are on the same chromosome are always transmitted together as a unit. D

Question 4

The middle gene of a three gene mapping experiment can be determined by examining the genotypes of which of the following?

Accepted Answer

A)  Offspring that resemble the parents 
B)  Offspring that exhibit a single crossover event 
C)  Offspring that exhibit double crossover events 
D)  None of the answers are correct 
A)  Offspring that resemble the parents 
B)  Offspring that exhibit a single crossover event 
C)  Offspring that exhibit double crossover events 
D)  None of the answers are correct

Question 5

An organism that contains patches of tissue that vary for a specific characteristic, such as a pigment is an example of which of the following?

Accepted Answer

A)  Linkage 
B)  Meiotic recombination 
C)  Mitotic recombination 
D)  Translocations 
E)  None of the answers are correct 
A)  Linkage 
B)  Meiotic recombination 
C)  Mitotic recombination 
D)  Translocations 
E)  None of the answers are correct

Question 6

A negative interference value indicates that the first crossover event enhanced the occurrence of
additional crossover events in the region.

Accepted Answer

A) True 
 B)False

Question 7

The end result of meiosis in fungi is a tetrad of spores.

Accepted Answer

A) True 
 B)False

Question 8

Another name for a chromosome is a , since it contains genes that are often inherited together.

Accepted Answer

A)  linkage group 
B)  crossing over group 
C)  genetic recombinant 
D)  bivalent 
A)  linkage group 
B)  crossing over group 
C)  genetic recombinant 
D)  bivalent

Question 9

A first division segregation (FDS) in the ordered octad ascus that has not had a crossover event has which of the following arrangements of the spores?

Accepted Answer

A)  3:1 
B)  4:4 
C)  2:4:2 
D)  9:3:3:1 
A)  3:1 
B)  4:4 
C)  2:4:2 
D)  9:3:3:1

Question 10

A genetic linkage map indicates that precise distance between two genes of interest.

Accepted Answer

A) True 
 B)False

Question 11

While mapping two genes in Drosophila, you observe 30 recombinants among 200 total offspring. What is the distance between these genes?

Accepted Answer

A)  30 map units 
B)  6.67 map units 
C)  200 map units 
D)  15 map units 
A)  30 map units 
B)  6.67 map units 
C)  200 map units 
D)  15 map units

Question 12

Which of the following procedures may be used to map genes in a fungi with an unordered tetrad ascus?

Accepted Answer

A)  Testcross 
B)  Monohybrid cross 
C)  Dihybrid cross 
D)  Chi-square analysis 
E)  Analysis of interference 
A)  Testcross 
B)  Monohybrid cross 
C)  Dihybrid cross 
D)  Chi-square analysis 
E)  Analysis of interference

Question 13

The rearrangement of alleles by the process of crossing over is called genetic linkage.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following statistical tests is used to determine if two genes are linked or assorting independently?

Accepted Answer

A)  Sum rule 
B)  Binomial expansion 
C)  Product rule 
D)  Chi-square test 
A)  Sum rule 
B)  Binomial expansion 
C)  Product rule 
D)  Chi-square test

Question 15

In a mapping experiment with three genes, which phenotype should occur most often in the F2 offspring?

Accepted Answer

A)  Parental phenotypes 
B)  Phenotypes of individuals with single crossover events 
C)  Phenotypes of individuals with double crossover events 
D)  All of the answers should be equal in the F2 generation 
A)  Parental phenotypes 
B)  Phenotypes of individuals with single crossover events 
C)  Phenotypes of individuals with double crossover events 
D)  All of the answers should be equal in the F2 generation

Question 16

The reproductive fungal structure that contains all of the products of a single meiotic division is called
the ascus.

Accepted Answer

A) True 
 B)False

Question 17

Following crossing-over, chromosomes with genetic combinations that resemble the parents are called
nonrecombinant.

Accepted Answer

A) True 
 B)False

Question 18

Assume that genes C and D are located on the same chromosome. On one chromosome, alleles C and D are found, while the homologue contains alleles c and d. Which of the following would be an example of a recombination event?

Accepted Answer

A)  Alleles C and D together on one chromosome 
B)  Alleles c and d together on one chromosome 
C)  Alleles C and d together on one chromosome 
D)  Alleles c and D together on one chromosome 
E)  Both alleles C and d together on one chromosome and alleles c and D together on one chromosome 
A)  Alleles C and D together on one chromosome 
B)  Alleles c and d together on one chromosome 
C)  Alleles C and d together on one chromosome 
D)  Alleles c and D together on one chromosome 
E)  Both alleles C and d together on one chromosome and alleles c and D together on one chromosome

Question 19

In fungi, the diploid structures are called spores.

Accepted Answer

A) True 
 B)False

Question 20

In fungi, the structure in which the position of the four spores in the ascus is an indication of their relationship to each other as they were produced during meiosis is called an .

Accepted Answer

A)  Unordered tetrad 
B)  Unordered octad 
C)  Ordered tetrad 
D)  Ordered octad 
A)  Unordered tetrad 
B)  Unordered octad 
C)  Ordered tetrad 
D)  Ordered octad

Exam 6: Genetic Linkage and Mapping in Eukaryotes

An ascus that contains two parental spores and two nonparental spores is called a tetratype.

In haploid fungi, which of the following is used to calculate the distance between the centromere and the gene of interest?

Which of the following is not one of the principles of linkage that Morgan obtained from his experiments?

The middle gene of a three gene mapping experiment can be determined by examining the genotypes of which of the following?

An organism that contains patches of tissue that vary for a specific characteristic, such as a pigment is an example of which of the following?

A negative interference value indicates that the first crossover event enhanced the occurrence of additional crossover events in the region.

The end result of meiosis in fungi is a tetrad of spores.

Another name for a chromosome is a , since it contains genes that are often inherited together.

A first division segregation (FDS) in the ordered octad ascus that has not had a crossover event has which of the following arrangements of the spores?

A genetic linkage map indicates that precise distance between two genes of interest.

While mapping two genes in Drosophila, you observe 30 recombinants among 200 total offspring. What is the distance between these genes?

Which of the following procedures may be used to map genes in a fungi with an unordered tetrad ascus?

The rearrangement of alleles by the process of crossing over is called genetic linkage.

Which of the following statistical tests is used to determine if two genes are linked or assorting independently?

In a mapping experiment with three genes, which phenotype should occur most often in the F2 offspring?

The reproductive fungal structure that contains all of the products of a single meiotic division is called the ascus.

Following crossing-over, chromosomes with genetic combinations that resemble the parents are called nonrecombinant.

Assume that genes C and D are located on the same chromosome. On one chromosome, alleles C and D are found, while the homologue contains alleles c and d. Which of the following would be an example of a recombination event?

In fungi, the diploid structures are called spores.

In fungi, the structure in which the position of the four spores in the ascus is an indication of their relationship to each other as they were produced during meiosis is called an .

Overview of Genetics

Mendelian Inheritance

Reproduction and Chromosome Transmission

Extensions of Mendelian Inheritance

Non-Mendelian Inheritance

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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