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Genetic Analysis Exam Answer Key - 1118 Verified Questions

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Genetic Analysis

Exam Answer Key

Course Introduction

Genetic Analysis explores the fundamental principles and methodologies used to study genes, genetic variation, and heredity in organisms. This course covers classical and molecular genetics concepts, including Mendelian inheritance, genetic mapping, gene interactions, and the molecular basis of gene function. Students will learn techniques such as linkage analysis, gene cloning, mutagenesis, and the use of model organisms to dissect genetic pathways. Emphasis is placed on problem-solving skills and experimental strategies to understand the genetic basis of biological processes and diseases.

Recommended Textbook

Essentials of Genetics 8th Edition by William S. Klug

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23 Chapters

1118 Verified Questions

1118 Flashcards

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Page 2

Chapter 1: Introduction to Genetics

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Sample Questions

Q1) Until the mid-1940s,many scientists considered proteins to be the likely candidates for the genetic material.Why?

Answer: Proteins are the most abundant,universally distributed components in cells.Because of their great structural and functional diversity,they were considered likely candidates.

Q2) Name the individual who,while working with the garden pea in the mid-1850s,demonstrated quantitative patterns of heredity and developed a theory involving the behavior of hereditary factors.

Answer: Gregor Mendel

Q3) What term refers to the similarity between parents and offspring,and what term refers to the lack of similarity between parents and offspring?

Answer: Heredity refers to the similarity between parents and offspring and the similarity of members of the same species.Variation refers to the lack of similarity between parents and offspring and members of the same species.

Q4) Alternative forms of a gene are called ________.

Answer: alleles

Q5) What is meant by the term gene?

Answer: a unit of inheritance

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Chapter 2: Mitosis and Meiosis

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Sample Questions

Q1) During interphase of the cell cycle,________.

A)DNA recombines

B)sister chromatids move to opposite poles

C)the nuclear membrane disappears

D)RNA replicates

E)DNA content essentially doubles

Answer: E

Q2) In a healthy female,how many secondary oocytes would be expected to form from 100 primary oocytes? How many first polar bodies would be expected from 100 primary oocytes?

A)200;\(\quad\)50

B)100;\(\quad\)50

C)200;\(\quad\)300

D)100; \(\quad\)100

E)50; \(\quad\)50

Answer: D

Q3) The meiotic cell cycle involves two cell divisions but only one DNA replication.

A)True

B)False

Answer: True

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Chapter 3: Mendelian Genetics

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Sample Questions

Q1) How many different types of gametes can be produced by an individual with the genotype AABbCCddEeFf?

Answer: 2³ = 8

Q2) In what ways is sample size related to statistical testing?

Answer: By increasing sample size,one increases the reliability of the statistical test and decreases the likelihood of erroneous conclusions from chance fluctuations in the data.

Q3) Assuming independent assortment,what proportion of the offspring of the cross AaBbCcDd X AabbCCdd will have the aabbccdd genotype?

Answer: zero

Q4) What conditions are likely to apply if the progeny from the cross AaBb X AaBb appear in the 9:3:3:1 ratio?

Answer: complete dominance,independent assortment,no gene interaction

Q5) Under what conditions does one expect a 1:1:1:1 ratio?

Answer: This occurs in a cross involving doubly heterozygous individuals crossed to fully recessive individuals.The genes involved assort independently.

Q6) What are two typical testcross ratios?

Answer: 1:1 and 1:1:1:1

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Page 5

Chapter 4: Modification of Mendelian Ratios

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Sample Questions

Q1) Typical ratios resulting from epistatic interactions in dihybrid crosses would be

A)9:3:3:1,1:2:1

B)1:1:1:1,1:4:6:4:1

C)9:3:4,9:7

D)1:2:2:4:1:2:1:2:1,1:2:1

E)3:1,1:1

Q2) The ABO blood group locus in humans provides an example of epistasis.

A)True

B)False

Q3) State a significant difference between X-linked and sex-influenced inheritance.

Q4) Assume that a cross is made between two organisms that are both heterozygous for a gene that shows incomplete dominance.What phenotypic and genotypic ratios are expected in the offspring?

Q5) A 9:7 ratio indicates incomplete dominance.

A)True

B)False

Q6) How many different alleles can a gene have?

Q7) What distinguishes sex-limited from sex-influenced inheritance?

Q8) Provide an example of sex-influenced inheritance.

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Chapter 5: Sex Determination and Sex Chromosomes

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Sample Questions

Q1) Under what condition might a human female have the XY sex chromosome complement?

Q2) Normally in humans,all the sons of a male showing a sex-linked phenotype will inherit the trait.

A)True

B)False

Q3) Sex-influenced genes cause males to be males and females to be females.

A)True

B)False

Q4) Although triple-X human females typically have normal offspring,what kinds of gametes,with respect to the X chromosomes,would you expect from such XXX females? Draw meiotic stages that show the gametes that are expected to be produced.

Q5) How many Barr bodies would one expect to see in cells of Turner syndrome females and Klinefelter syndrome males?

Q6) A small part of the human Y chromosome contains the gene that is responsible for determining maleness.What is the name of this gene?

Q7) Data produced by C.Bridges in the early part of this century indicate that sex in Drosophila is determined by ________.

Q8) What is the composition of a Barr body?

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Chapter 6: Chromosome Mutations: Variation in Number and Arrangement

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Sample Questions

Q1) Given that a human normally contains 46 chromosomes,give the chromosome number for each of the following conditions:

Turner syndrome (female,no Barr bodies) Klinefelter syndrome (male,one Barr body) triploid Down syndrome (trisomic) trisomy 13

Q2) Chorionic villus sampling (CVS)is sometimes preferred to amniocentesis because results can be provided earlier in the pregnancy.

A)True

B)False

Q3) Inversions suppress crossing over by providing a chemical imbalance because of breakpoints within certain genes.

A)True

B)False

Q4) What is meant by the terms acentric and dicentric?

Q5) Clearly illustrate the pairing configuration of an inversion (paracentric)heterokaryotype.

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Chapter 7: Linkage and Chromosome Mapping in Eukaryotes

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Sample Questions

Q1) Under what circumstance might two loci be on the same chromosome but behave as if independently assorting in crosses?

Q2) If interference is complete,what is the frequency of double crossovers?

Q3) Assume that a cross is made between AaBb and aabb plants and that the offspring fall into approximately equal numbers of the following groups: AaBb,Aabb,aaBb,aabb.These results are consistent with ________.

A)independent assortment

B)alternation of generations

C)complete linkage

D)incomplete dominance

E)hemizygosity

Q4) What are two commonly used DNA landmarks for mapping human genes?

Q5) What advantage does BrdU (bromodeoxyuridine)have in the study of chromosome structure and recombination?

Q6) Assume that two genes are 80 map units apart on chromosome II of Drosophila and that a cross is made between a doubly heterozygous female and a homozygous recessive male.What percent recombination would be expected in the offspring of this type of cross?

Q7) What is the expected evolutionary significance of genetic recombination?

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Chapter 8: Genetic Analysis and Mapping in Bacteria and Bacteriophages

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Sample Questions

Q1) R plasmids often contain genes for antibody production.

A)True

B)False

Q2) Bacteriophages engage in two interactive cycles with bacteria.What are these cycles?

A)lytic and lysogenic

B)insertion and replication

C)auxotrophic and prototrophic

D)heteroduplex and homoduplex

E)negative and positive

Q3) Transduction is a form of recombination in bacteria that involves ________.

A)5-bromouracil

B)F plasmids

C)bacteriophages

D)fertility factors

E)physical contact between the bacteria involved

Q4) Explain what is meant by the term heteroduplex in the context of bacterial transformation.

Page 10

Q5) When a bacteriophage genome incorporates itself into the chromosome of the host,that phage genome is referred to as a(an)________.

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Chapter 9: DNA structure and Analysis

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Sample Questions

Q1) In the classic experiment conducted by Hershey and Chase,why was the pellet radioactive in the centrifuge tube that contained bacteria with viruses?

A)The bacteria were in the pellet,and they had incorporated radioactive proteins into their cell membranes.

B)The radioactive viruses (coats plus DNA)were in the pellet.

C)The bacteria were in the pellet,and many contained the radioactive viral DNA.

D)The radioactive protein coats of the viruses were in the pellet.

E)The radioactive viruses were in the pellet,and the bacteria were in the supernatant.

Q2) At what approximate wavelengths do DNA,RNA,and proteins maximally absorb light?

Q3) When considering the structure of DNA,we would say that complementary strands are antiparallel.

A)True

B)False

Q4) What was the Avery et al.'s (1944)contribution to the understanding of molecular biology?

Q5) List two major differences between RNA and DNA at the level of the nucleotide.

Q6) What is meant by the term antiparallel?

Q7) Describe four major functions of DNA in a cell.

Page 11

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Chapter 10: DNA Replication and Recombination

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Sample Questions

Q1) Which cluster of terms accurately reflects the nature of DNA replication in prokaryotes?

A)fixed point of initiation,bidirectional,conservative

B)fixed point of initiation,unidirectional,conservative

C)random point of initiation,bidirectional,semiconservative

D)fixed point of initiation,bidirectional,semiconservative

E)random point of initiation,unidirectional,semiconservative

Q2) What three possible models were suggested to originally describe the nature of DNA replication?

Q3) Structures located at the ends of eukaryotic chromosomes are called ________.

A)centromeres

B)telomerases

C)recessive mutations

D)telomeres

E)permissive mutations

Q4) In ligase-deficient strains of E.coli,DNA and chromosomal replication are unaltered because ligase is not involved in DNA replication.

A)True

B)False

Q5) Compare the rate of DNA replication in prokaryotes and eukaryotes.

Page 12

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Chapter 11: Chromosome Structure and DNA Sequence

Organization

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Sample Questions

Q1) When native chromatin is digested with micrococcal nuclease,what significant result occurs?

Q2) What are histones,and how are they arranged in nucleosomes?

Q3) Briefly describe the makeup of VNTRs (variable number tandem repeats).

Q4) In the formation of nucleosomes,one histone class,H1,is not directly involved,yet it does associate with DNA to form higher-level chromosomal structures.Where does this histone (H1)associate?

Q5) In addition to highly repetitive and unique DNA sequences,a third category of DNA sequences exists.What is it called,and which types of elements are involved in it?

A)composite DNA; telomeres and heterochromatin

B)dominant DNA; euchromatin and heterochromatin

C)multiple gene family DNA; hemoglobin and 5.0S RNA

D)moderately repetitive DNA; SINEs,LINEs,and VNTRs

E)permissive DNA; centromeres and heterochromatin

Q6) In contrast with euchromatin,heterochromatin contains more genes and is earlier replicating.

A)True

B)False

Q7) Describe the chromosomal conformations of ?X174 and polyoma viruses.

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Chapter 12: The Genetic Code and Transcription

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Sample Questions

Q1) In eukaryotes,which three factors appear to encourage the specific association of RNA polymerase(s)to a specific region of DNA?

Q2) Describe the function of N-formylmethionine in prokaryotes.

Q3) What is meant by the term heterogeneous nuclear RNA (hnRNA)?

Q4) Suppose that in the use of polynucleotide phosphorylase,nucleotides A and C are added in a ratio of 1A:5C.What is the probability that an AAA sequence will occur?

Q5) The enzyme polynucleotide phosphorylase is capable of generating a random assembly of ribonucleotides.

A)True

B)False

Q6) Which of the following contains the three posttranscriptional modifications often seen in the maturation of mRNA in eukaryotes?

A)5'-capping,3'-poly(A)tail addition,splicing

B)3'-capping,5'-poly(A)tail addition,splicing

C)removal of exons,insertion of introns,capping

D)5'-poly(A)tail addition,insertion of introns,capping

E)heteroduplex formation,base modification,capping

Q7) Describe a difference between the RNA polymerases of eukaryotes and prokaryotes.

Page 14

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Chapter 13: Translation and Proteins

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Sample Questions

Q1) What are polyribosomes?

Q2) Regarding the protein structure,how are -pleated sheets arranged and stabilized?

Q3) Draw and label the spatial and polarity relationships among the following translational components: ribosome (small and large subunits),growing polypeptide chains,amino acid attachment to tRNA,mRNA,codon,and anticodon.

Q4) By their experimentation using the Neurospora fungus,Beadle and Tatum were able to propose the far-reaching hypothesis that ________.

A)prototrophs will grow only if provided with nutritional supplements

B)several different enzymes may be involved in the same step in a biochemical pathway

C)the role of a specific gene is to produce a specific enzyme

D)genetic recombination occurred in Neurospora

E)more than one codon can specify a given amino acid

Q5) In what ways do the amino acid side chains interact to influence protein function?

Q6) Describe the basic structure of normal adult hemoglobin and the abnormality observed in sickle-cell hemoglobin.

Q7) During translation,which triplets signal chain termination?

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Page 15

Chapter 14: Gene Mutation,DNA Repair,and Transposition

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Sample Questions

Q1) All insertion sequences (IS elements)contain two features that are essential for their movement.What are these two elements?

A)transposase and inverted terminal repeats

B)integrase and pseudogenes

C)integrase and oncogenes

D)proto-oncogenes and oncogenes

E)transposase and oncogenes

Q2) Nutritional mutations can be defined as ________.

A)those mutations that do not allow a bacterium or fungus to grow on minimal medium but do allow growth on complete medium

B)those mutations that change the composition of the medium

C)those mutations belonging to the group called prototrophs

D)those mutations caused by site-specific mutagenesis

E)all strains that are not auxotrophic

Q3) How was it determined that X-rays are mutagenic?

Q4) DNA may be damaged from the by-products of normal cellular aerobic respiration.Name three of these electrophilic oxidants that are generally classified as reactive oxidants.

Q5) How were insertion sequences (IS elements)first discovered?

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Chapter 15: Regulation of Gene Expression

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Sample Questions

Q1) A constitutive mutation in the lac operon may be of several types.Name two types of constitutive mutations.

Q2) Alternative RNA splicing is a method that apparently evolved for the production of many different polypeptides from the same pre-mRNA.Provide an example of alternative splicing.

Q3) Describe three characteristics of enhancers.

Q4) Which term refers to a contiguous genetic complex that is under coordinated control?

A)lysogen

B)prototroph

C)operon

D)allosteric

E)attenuation

Q5) Describe how nucleosomes may influence gene transcription.

Q6) What is the function of the lacY gene in the lac operon?

Q7) In general,one could say that there are fewer levels of regulation possible in prokaryotes than in eukaryotes.

A)True

B)False

Q8) List three different types of genetic regulation in eukaryotes.

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Chapter 16: The Genetics of Cancer

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Sample Questions

Q1) Much has been written about p53 in terms of cancer biology.What is p53,and what is its significance?

Q2) Which protein appears to regulate the entry of cells into an S phase? This protein is also known as the "guardian of the genome."

A)p34

B)p102

C)cyclin

D)p53

E)phosphokinase

Q3) Describe the cellular and molecular function of the ras gene family and the consequences of mutations in ras.

Q4) There are several checkpoints in the mitotic cell cycle.All occur in the S phase.

A)True

B)False

Q5) A retrovirus uses reverse transcriptase to make a DNA copy of RNA.

A)True

B)False

Q6) Why do cancer researchers study molecular events associated with mitosis?

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Chapter 17: Recombinant DNA Technology

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Sample Questions

Q1) In the polymerase chain reaction,what is the purpose of the initial high temperature? What is the purpose of cooling in the second step?

Q2) Nucleic acid blotting is widely used in recombinant DNA technology.In a Southern blot,one generally ________.

A)hybridizes filter-bound DNA with a DNA probe

B)hybridizes filter-bound RNA with a DNA probe

C)examines amino acid substitutions with radioactive probes

D)cleaves RNA with restriction endonucleases

E)ligates DNA with DNA ligase

Q3) List two especially useful characteristics of cloning vectors.

A)high copy number and antibiotic resistance gene(s)

B)virulence and lysogenicity

C)ability to integrate into the host chromosome and then causing a lytic cycle

D)nonautonomous replication and transposition

E)reverse transcriptase and ligase activities

Q4) Assume that you have cut DNA with the restriction enzyme HindIII.You separate the fragments on an agarose gel and stain the DNA with ethidium bromide.You notice that the intensity of the stain is less in the bands that have migrated closer to the "+" pole.Give an explanation for this finding.

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Chapter 18: Genomics,Bioinformatics,and Proteomics

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Sample Questions

Q1) What appears to be the range of the number of protein-coding genes per genome in eukaryotes?

Q2) Sequencing the dog genome has indicated that a single locus on chromosome 15 may play a major role in genetically distinguishing large dog breeds from small dog breeds.

A)True

B)False

Q3) Bacterial genes have introns,and eukaryotic genes lack introns.

A)True

B)False

Q4) Most of the bacterial genomes described in the text have fewer than ________.

A)10,000 genes

B)5000 base pairs

C)500 genes

D)10,000 base pairs

E)50 genes

Q5) The genomic organization of all living creatures is identical.

A)True

B)False

Q6) What is comparative genomics?

Page 20

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Chapter 19: Applications and Ethics of Genetic Engineering and Biotechnology

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Sample Questions

Q1) The Human Genome Project seeks to rid the human population of genetic disease. A)True

B)False

Q2) What makes "golden rice" golden?

Q3) How is a microarray used to scan for mutations in a genome?

Q4) Drosophila is a unique candidate for genetic engineering because it is the one prokaryote about which we have a great deal of genetic information.

A)True

B)False

Q5) Briefly describe what is meant by the term edible vaccine.

Q6) The first person to receive gene therapy was a young girl with adenosine deaminase (ADA)deficiency.Outline the therapeutic steps involved.

Q7) Rational drug design involves the synthesis of specific chemical substances that affect specific gene products.

A)True

B)False

Page 21

Q8) Alleles that differ by as little as a single nucleotide can be distinguished by synthetic probes known as ________.

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Chapter 20: Developmental Genetics

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Sample Questions

Q1) Provide a brief description of segment polarity genes,including their regulation and their molecular and developmental effects.

Q2) In Drosophila,the sequential order of the function of segmentation genes is

A)gap,segment-polarity,pair-rule

B)pair-rule,transdeterminal,gap

C)transdeterminal,gap,pair-rule

D)gap,pair-rule,segment-polarity

E)segmentational,helical,spherical

Q3) Immediately after fertilization of a Drosophila egg,the zygote nucleus undergoes a series of divisions.Subsequent nuclear migration generates a(n)________.

A)syncytial blastoderm

B)maternal effect

C)homeodomain

D)zygote

E)cleavage nucleus

Q4) Define determination and differentiation.

Q5) What is the general order of genes involved in determining early Drosophila development?

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Chapter 21: Quantitative Genetics and Multifactorial Traits

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Sample Questions

Q1) Traits such as height,general body structure,skin color,and some behavioral traits are probably caused primarily by genes that behave codominantly or epistatically.

A)True

B)False

Q2) Typically,one thinks of identical (MZ)twins being genetically identical.However,genomic differences do exist between MZ twins by epigenetic processes.What are epigenetic processes?

Q3) To estimate how much the means of a variety of like samples drawn from the same population might vary,which statistic is often used and what is its formula?

Q4) What is the term given to a random subset of individuals who are selected for measurement in a particular study?

Q5) What are the name and formula for describing sample variability?

Q6) Describe the value of using twins in the study of questions relating to the relative impact of heredity versus environment.

Q7) What is the name of the process of selecting a specific group of organisms from an initially heterogeneous population for future breeding purposes?

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Chapter 22: Population and Evolutionary Genetics

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Sample

Questions

Q1) Mutation and migration introduce new alleles into populations.What is the most likely principal force that will shift allelic frequencies within large populations?

Q2) A number of mechanisms operate to maintain genetic diversity in a population.Why is such diversity favored?

A)Homozygosity is an evolutionary advantage.

B)Diversity leads to inbreeding advantages.

C)Genetic diversity may better adapt a population to inevitable changes in the environment.

D)Greater genetic diversity increases the chances of haploidy.

E)Genetic diversity helps populations avoid diploidy.

Q3) Evolution is dependent on genetic diversity in the evolving population.

A)True

B)False

Q4) Which would change allele frequencies more quickly: selection against a dominant allele or selection against a recessive allele?

Q5) List at least three factors that change gene frequencies in populations.

Q6) List at least five of the assumptions that pertain to a population in a Hardy-Weinberg equilibrium.

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Chapter 23: Conservation Genetics

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Sample Questions

Q1) The loss of previously existing genetic diversity from a population or a species is referred to as ________.

Q2) Briefly describe what is meant by a population bottleneck.

Q3) Intrapopulation genetic diversity increases under prolonged conditions of population fragmentation.

A)True

B)False

Q4) The shrinking of available habitat reduces populations of wild species and often also isolates them from one another.Individual populations become trapped in pockets of undeveloped land surrounded by areas of agriculture.This process is called ________.

A)isolation

B)stagnation

C)overdevelopment

D)underdevelopment

E)population fragmentation

Q5) Describe a potential problem associated with population augmentation.

Q6) The founder effect generally results in an increase in heterozygosity.

A)True

B)False

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