Molecular Genetics Study Guide Questions
Course Introduction
Molecular Genetics explores the molecular foundations of genetic processes in living organisms, focusing on the structure, function, and regulation of genes at the DNA, RNA, and protein levels. The course examines mechanisms of DNA replication, repair, and recombination, as well as gene expression and regulation in prokaryotes and eukaryotes. It also covers modern genetic technologies, such as genetic engineering, CRISPR, and genomic analysis, highlighting their applications in medicine, biotechnology, and research. Through lectures and practical examples, students gain a thorough understanding of how genetic information is transferred, manipulated, and expressed at the molecular level.
Recommended Textbook
Introduction to Genetic Analysis 11th Edition by Anthony J.F. Griffiths
Available Study Resources on Quizplus
20 Chapters
931 Verified Questions
931 Flashcards
Source URL: https://quizplus.com/study-set/3644 Page 2
Chapter 1: The Genetics Revolution
Available Study Resources on Quizplus for this Chatper
20 Verified Questions
20 Flashcards
Source URL: https://quizplus.com/quiz/72451
Sample Questions
Q1) Choose the best answer from the list below.Not all of the answers will be used.
a.alleles
b.de novo mutations
c.point mutations
d.nucleases
e.DNA polymerase
f.Tatum and Beadle
g.Gregor Mendel
1.___one-gene-one-enzyme hypothesis
2.___gene variants
3.___cut DNA at specific location
4.___unique DNA variants that exist in a child but neither of its parents.
5.___DNA replication
Answer: 1. ___f__one-gene-one-enzyme hypothesis
2. ___a__gene variants
3. ___d__cut DNA at specific location
4. ___b__unique DNA variants that exist in a child but neither of its parents.
5. ___e__DNA replication
To view all questions and flashcards with answers, click on the resource link above. Page 3
Chapter 2: Single-Gene Inheritance
Available Study Resources on Quizplus for this Chatper
50 Verified Questions
50 Flashcards
Source URL: https://quizplus.com/quiz/72452
Sample Questions
Q1) Cystic fibrosis is an autosomal recessive condition.If the parents of a boy with cystic fibrosis have two more children,what is the probability that both of these children will be unaffected?
A)1/16
B)3/16
C)4/16
D)9/16
E)16/16
Answer: D
Q2) You have three jars of gumballs.The first jar has 100 white gumballs and 25 green,the second jar has 50 white and 150 blue,and the third jar contains 500 white and 10 red. If you randomly draw one gumball from each jar,what is the probability for \(\textbf{ all white OR all colored gumballs? }\)
A)0)199 or 19.9%
B)0)112 or 11.2%
C)0)058 or 5.8%
D)0)589 or 58.9%
E)This is impossible (0% chance).
Answer: A
To view all questions and flashcards with answers, click on the resource link above. Page 4
Chapter 3: Independent Assortment of Genes
Available Study Resources on Quizplus for this Chatper
55 Verified Questions
55 Flashcards
Source URL: https://quizplus.com/quiz/72453
Sample Questions
Q1) An arginine-requiring strain of Neurospora is crossed to a wild-type (prototrophic)strain.
a)In the first cross,half of the progeny are arginine-requiring and half are wild type.What does this tell you about the genetic basis of the arginine-requiring mutant?
b)In the second,the progeny are 83 arginine-requiring and 13 wild type.The germination percentage of ascospores is 95/100%.Explain these results simply,and tell briefly how you would confirm your explanation.
Answer: a)The arginine mutant results from a mutation at one gene.Two alleles: mutant and wild type.
b)In a haploid,failure to get 1:1 segregation for a character,without inviability of one class,makes one consider two- and three-gene models.If the arg parent were carrying two mutations in the same path,and they assorted independently,the cross (a/b * a<sup>+</sup>/b<sup>+</sup>)would yield four progeny types,only one being able to grow without arginine.In the present case,three genes seem to be assorting (independently)since only 1/8 (13/100)are prototrophic.
To view all questions and flashcards with answers, click on the resource link above. Page 5
Chapter 4: Mapping Eukaryote Chromosomes by
Recombination
Available Study Resources on Quizplus for this Chatper
64 Verified Questions
64 Flashcards
Source URL: https://quizplus.com/quiz/72454
Sample Questions
Q1) A sweet pea plant of genotype A/A <sup>.</sup> B/B is crossed to one that is a/a <sup>.</sup> b/b to produce a dihybrid F<sub>1</sub>.One cell of one F<sub>1</sub> individual (genotype A/a <sup>.</sup> B/b)goes through meiosis and produces four gametes of the following genotypes: A <sup>.</sup><sup> </sup>b,A <sup>.</sup><sup> </sup>b,a <sup>.</sup>B and a <sup>.</sup>B.What can be concluded regarding the linkage relationship between the two genes?
A)Genes A and B are linked;the result is indicative of linkage as the gametes are recombinants.
B)Genes A and B are linked;the result is indicative of linkage as the gametes are the products of crossovers.
C)Genes A and B could be linked or unlinked;the result is not indicative of either,because in both cases it's possible to obtain 100% recombinant gametes from one meiosis.
D)Genes A and B could be linked or unlinked;the result is unusual as we should never obtain more than 50% recombinants from one meiosis.
E)Genes A and B are unlinked;the result is indicative of independent assortment as only two genotypes are represented among the gametes.
To view all questions and flashcards with answers, click on the resource link above.
Page 6
Chapter 5: The Genetics of Bacteria and Their Viruses
Available Study Resources on Quizplus for this Chatper
43 Verified Questions
43 Flashcards
Source URL: https://quizplus.com/quiz/72455
Sample Questions
Q1) The three bacterial markers a,b,and c are linked,but their order is unknown.A cotransduction experiment is performed and the following results are obtained.Markers a and b are co-transduced at a frequency of 2%.
- Markers a and c are co-transduced at a frequency of 20%.
- Markers b and c are co-transduced at a frequency of 65%. What can be concluded about the arrangement of the three markers on the bacterial chromosome?
A)The order is a-b-c,and b is closer to a than to c.
B)The order is a-b-c,and b is closer to c than to a.
C)The order is a-c-b,and c is closer to b than to a.
D)The order is b-a-c,and a is closer to b than to c.
E)The order is b-c-a,and c is closer to a than to b.
Q2) The most commonly used phage characters in the study of phage inheritance are:
A)phage morphology and host morphology.
B)phage morphology and host range.
C)plaque morphology and host morphology.
D)plaque morphology and host range.
E)plaque morphology and phage morphology.
To view all questions and flashcards with answers, click on the resource link above.
Page 7
Chapter 6: Gene Interaction
Available Study Resources on Quizplus for this Chatper
47 Verified Questions
47 Flashcards
Source URL: https://quizplus.com/quiz/72456
Sample Questions
Q1) You are studying loppins (fictitious but useful invertebrates)and are interested in the inheritance of the colorful dots on their abdomen.You notice that some loppins have no dots,some have green dots,some have orange dots,and some have a mixture of orange and green dots.
a)The first thing you notice is that it's relatively easy to obtain lines that breed true for the absence of dots,for the presence of orange dots only,or for the presence of green dots only,but it seems impossible to get pure-breeding loppins that have both green and orange dots.Every time that you cross two green-and-orange-dotted individuals,you obtain an F<sub>1 </sub>comprised of about 50% green-and-orange-dotted,25% orange-dotted,and 25% green-dotted individuals. What do you conclude? Explain your reasoning and use appropriate symbols to indicate the genotypes of the various individuals.
b)How could you determine genetically whether or not the "no dots" phenotype is allelic to "green dots," "orange dots," and "orange-and-green dots"? Outline the crosses that you would set up as well as the expected results if "no dots" was allelic versus if it was not allelic to the other phenotypes.
To view all questions and flashcards with answers, click on the resource link above.
Page 8
Chapter 7: Dna: Structure and Replication
Available Study Resources on Quizplus for this Chatper
50 Verified Questions
50 Flashcards
Source URL: https://quizplus.com/quiz/72457
Sample Questions
Q1) When replicating the end of a chromosome,the lagging strand cannot copy the last ~10 nucleotides at the end of the chromosome.As a result,chromosomes contain telomere sequences at their ends,which are defined as:
A)special DNA sequences that do not require priming for replication.
B)noncoding,repetitive sequences that can be copied independent of the replisome.
C)noncoding,repetitive sequences that are not replicated during DNA replication.
D)protein-based structures at the ends of chromosomes that protect the chromosome end.
E)All of the answer options are correct.
Q2) Topoisomerase and helicase have distinct functions that include which of the following?
A)Topoisomerase is responsible for unwinding the double helix (separating strands).
B)Helicase is responsible for unwinding the double helix (separating strands).
C)Helicase relieves supercoiling that occurs in front of the replication fork.
D)The enzymes have nearly identical activities but are located at different sites during DNA replication.
E)These enzymes are nearly identical but have been given distinct names.
To view all questions and flashcards with answers, click on the resource link above. Page 9
Chapter 8: Rna: Transcription and Processing
Available Study Resources on Quizplus for this Chatper
53 Verified Questions
53 Flashcards
Source URL: https://quizplus.com/quiz/72458
Sample Questions
Q1) The experimental value of a "pulse-chase" cellular labeling experiment using radioactive uracil is that:
A)all RNAs within a cell are labeled and easily detected.
B)the radioactivity allows for easy purification of cellular nucleic acids.
C)all RNAs created during the pulse are labeled and detectable,revealing their stability and localization.
D)the spliceosome function is easily seen with radiolabeled RNAs in the cellular cytosol.
E)cells adapt to the pulse of radioactivity,revealing nucleic acid repair mechanisms.
Q2) The role of tRNA is to:
A)serve as an intermediate in the decoding of genes.
B)act as transporters bringing amino acids to the site of protein synthesis.
C)serve as general translational components of the ribosome.
D)facilitate splicing of pre-messenger RNAs.
E)facilitate protein trafficking in protein secretion.
Q3) Name the three major modifications of mRNA in eukaryotes before it is transported to the cytoplasm.In addition,tell why each of the modifications is necessary.
To view all questions and flashcards with answers, click on the resource link above.
Chapter 9: Proteins and Their Synthesis
Available Study Resources on Quizplus for this Chatper
53 Verified Questions
53 Flashcards
Source URL: https://quizplus.com/quiz/72459
Sample Questions
Q1) The three-dimensional structure of an active hemoglobin (heterotetramer)structure would be referred to as its:
A)primary structure.
B)secondary structure.
C)tertiary structure.
D)quaternary structure.
E)quinternary structure.
Q2) How many nucleotides would be expected for a gene coding for a protein with 300 amino acids?
A)300
B)100
C)600
D)1200
E)900
Q3) Fibrous proteins contain a structure that is:
A)rounded and compact.
B)globular.
C)only comprised of secondary structure.
D)linear/extended.
E)random and variable.
To view all questions and flashcards with answers, click on the resource link above. Page 11
Chapter 10: Gene Isolation and Manipulation
Available Study Resources on Quizplus for this Chatper
55 Verified Questions
55 Flashcards
Source URL: https://quizplus.com/quiz/72460
Sample Questions
Q1) Human insulin can be made purer,and at a lower cost,using recombinant DNA technology.What sort of DNA clone might be ligated into a bacterial expression plasmid to be used in this strategy?
Q2) Which of the following sequences includes a clear eight base pair palindrome?
A)5 -CCGATCGATCCC-3
B)5 -TGGGGTTTT G-3
C)5 -GGGGAAAA-3
D)5 -GATCCTAG-3
E)5 -AACCAACCAA-3
Q3) Foreign DNA can be introduced into a cell using which of the following method/s?
A)transformation
B)projectile gun
C)injection
D)virus infection
E)All of the answer options are correct.
Q4) When ligating pieces of DNA into a plasmid,a scientist will often transform the ligation products into competent bacteria to evaluate the success rate of the ligation (i.e.,the number of plasmids that now have extra DNA ligated into their sequence).Define one quick way scientists can assess the success rate of a ligation just by looking at the bacterial colonies.
To view all questions and flashcards with answers, click on the resource link above. Page 12
Chapter 11: Regulation of Gene Expression in Bacteria and Their Viruses
Available Study Resources on Quizplus for this Chatper
55 Verified Questions
55 Flashcards
Source URL: https://quizplus.com/quiz/72461
Sample Questions
Q1) In the bacteriophage \(\lambda\),cro gene encodes the Cro repressor,which:
A)represses lytic growth and promotes lysogeny.
B)represses lysogeny and permits lytic growth.
C)represses both lytic growth and lysogeny.
D)promotes lysogeny.
E)None of the answer options are correct.
Q2) The repression of the transcription of lactose-metabolizing genes in the presence of glucose is an example of:
A)catabolite induction.
B)anabolite induction.
C)anabolite repression.
D)catabolite repression.
E)None of the answer options are correct.
Q3) The enzyme \(\beta\)-galactosidase can convert the disaccharide lactose into:
A)allolactose.
B)glucose.
C)allolactose and glucose.
D)allolactose,glucose,and galactose.
E)sucrose and glucose.
Page 13
To view all questions and flashcards with answers, click on the resource link above.
Chapter 12: Regulation of Gene Expression in Eukaryotes
Available Study Resources on Quizplus for this Chatper
46 Verified Questions
46 Flashcards
Source URL: https://quizplus.com/quiz/72462
Sample Questions
Q1) Regions of a chromosome that are packaged in less-condensed chromatin are known as:
A)homochromatin.
B)heterochromatin.
C)euchromatin.
D)epichromatin.
E)hyperchromatin.
Q2) Describe the difference between transcriptional gene regulation and post-transcriptional gene regulation in eukaryotes.
Q3) What portion of a histone is typically modified by acetylation/de-acetylation?
A)acidic amino acid residues in the "head" region of the histone
B)basic amino acid residues in the "head" region of the histone
C)basic amino acid residues in the "tail" region of the histone
D)acidic amino acid residues in the "head" region and basic amino acid residues in the "tail" region
E)None of the answer options are correct.
Q4) The miRNA-RISC complex is known to inhibit translation.List several possible mechanisms for translational inhibition mediated by miRNA-RISC.
To view all questions and flashcards with answers, click on the resource link above.
Page 14
Chapter 13: The Genetic Control of Development
Available Study Resources on Quizplus for this Chatper
35 Verified Questions
35 Flashcards
Source URL: https://quizplus.com/quiz/72463
Sample Questions
Q1) There are ______ Hox genes in the laboratory mouse.
A)12
B)8
C)10
D)25
E)39
Q2) Why would animals as diverse as mice,humans,and Drosophila have maintained nearly identical Hox genes?
Q3) The class of genes required for establishing the formation of a contiguous block of segments is the:
A)maternal-effect genes.
B)gap genes.
C)pair-rule genes.
D)segment polarity genes.
E)Hox genes.
Q4) A scientist working in a Drosophila lab locates a mutation in an organism that caused antenna to be transformed into legs.He determines that this is a homeotic transformation.Do you agree?
To view all questions and flashcards with answers, click on the resource link above. Page 15
Chapter 14: Genomes and Genomics
Available Study Resources on Quizplus for this Chatper
26 Verified Questions
26 Flashcards
Source URL: https://quizplus.com/quiz/72464
Sample Questions
Q1) Which of the following is/are FALSE concerning the comparisons between genetic,physical,and cytogenetic maps?
A)The distance between two linked markers is the same in genetic and physical maps because crossing over occurs with equal frequency along the entire length of the chromosome.
B)Restriction maps,contig maps,and STS maps are examples of physical maps.
C)In physical maps,the distances between markers are given in megabases (Mb)where 1 Mb is approximately equal to 1 cM.
D)The banding patterns of chromosomes created by different staining techniques are used in constructing cytogenetic maps.
E)In genetic maps,the distances between various markers (for example,genes or RFLPs)are given in map units or centiMorgans.
Q2) Sanger DNA sequencing determines the nucleotide sequence because:
A)dideoxy nucleotides are incorporated into a growing DNA strand.
B)dideoxy nucleotides terminate the growing DNA strand.
C)PPi is incorporated into the growing DNA strand.
D)PPi is released from the growing DNA strand.
E)None of the answer options are correct.
To view all questions and flashcards with answers, click on the resource link above. Page 16
Chapter 15: The Dynamic Genome: Transposable Elements
Available Study Resources on Quizplus for this Chatper
31 Verified Questions
31 Flashcards
Source URL: https://quizplus.com/quiz/72465
Sample Questions
Q1) Match the following transposable elements with the species where it is found.
i.humans (A)Dt element
ii.Drosophila (B)Ty1 element
iii.yeast (C)L1 element
iv.maize (D)P element
Q2) A corn plant is homozygous for a mutant allele that results in no pigment in the seed (i.e.,white).The mutant is caused by Ds insertion that often exits late in seed development,when there is an active Ac element in the genome.If there is NO active Ac element,the seeds of this plant will be:
A)no pigment (i.e. ,white).
B)pigmented all over.
C)white with small spots of pigment.
D)white with large spots of pigment.
E)weakly pigmented.
Q3) a)What is the C-value paradox?
b)What is the explanation for the C-value paradox?
Q4) Compare and contrast IS elements,simple transposons,and composite transposons.Use diagrams to help in the comparison.
Q5) Compare and contrast autonomous and nonautonomous transposable elements.
To view all questions and flashcards with answers, click on the resource link above. Page 17
Chapter 16: Mutation, Repair, and Recombination
Available Study Resources on Quizplus for this Chatper
50 Verified Questions
50 Flashcards
Source URL: https://quizplus.com/quiz/72466
Sample Questions
Q1) The fluctuation test of Luria and Delbruck showed that:
A)a selecting agent can affect mutation rate in E.coli.
B)mutations can arise spontaneously before exposure to the selecting agent.
C)mutations in E.coli occur at a relatively high frequency.
D)the mutation rate in E.coli fluctuates greatly from one generation to the next.
E)the T1 phage can act as a mutagen as well as a selecting agent in E.coli.
Q2) The Spo11 enzyme in eukaryotic cells makes:
A)single-stranded cuts in the DNA to initiate replication.
B)double-stranded cuts in the DNA to initiate replication.
C)single-stranded cuts in the DNA to initiate recombination.
D)double-stranded cuts in the DNA to initiate recombination.
E)causes cancer.
Q3) In E.coli,a region flanked by two repeats of a sequence such as GTGGTGAA is prone to:
A)deletions.
B)duplications.
C)frameshift mutations.
D)missense mutations.
E)reversion.
To view all questions and flashcards with answers, click on the resource link above.
Page 18
Chapter 17: Large-Scale Chromosomal Changes
Available Study Resources on Quizplus for this Chatper
49 Verified Questions
49 Flashcards
Source URL: https://quizplus.com/quiz/72467
Sample Questions
Q1) A wild-type chromosome can be represented as ABC[*]DEFGH,and from this a chromosomal aberration arises that can be represented ABC[*]DEGFH,where [*] represents the centromere.This aberration is known as a: A)deletion.
B)duplication.
C)paracentric inversion.
D)pericentric inversion.
E)translocation.
Q2) In an animal bearing the heterozygous inversion ABCDE[*]FGHI / ABGF[*]EDCHI,in one meiocyte,a crossover occurred between the D and E loci and another crossover occurred between the F and G loci.The two crossovers involved the same two chromatids.What will be the proportion of abnormal meiotic products from that meiosis? (Note: [*] = centromere.)
A)0%
B)25%
C)50%
D)100%
E)It depends on the distance between D and E and between F and G.
To view all questions and flashcards with answers, click on the resource link above. Page 19
Chapter 18: Population Genetics
Available Study Resources on Quizplus for this Chatper
48 Verified Questions
48 Flashcards
Source URL: https://quizplus.com/quiz/72468
Sample Questions
Q1) If two populations of birds with frequencies of an allele a of 0.2 and 0.3 are forced together by unusually high winds,the new frequency of the a allele in the combined population will be:
A)0.2.
B)0.25.
C)0.3.
D)0.5.
E)It is impossible to determine unless we know the population sizes.
Q2) Red hair (autosomal recessive)is found in approximately 4 percent of the people in Norway.If we assume that the Norwegian population is in Hardy-Weinberg equilibrium with respect to hair color:
a)what are the frequencies of the red hair (r)and non-red hair (R)alleles?
b)what is the frequency of heterozygotes?
c)what proportion of all marriages could potentially have a child with red hair?
Q3) Two chromosomes having the same combination of alleles at multiple loci are said to be of similar:
A)genotype.
B)haplotype.
C)phenotype.
D)sporotype.
To view all questions and flashcards with answers, click on the resource link above. Page 20
Chapter 19: The Inheritance of Complex Traits
Available Study Resources on Quizplus for this Chatper
36 Verified Questions
36 Flashcards
Source URL: https://quizplus.com/quiz/72469
Sample Questions
Q1) Which of the following statements is/are a central assumption of the multifactorial inheritance hypothesis?
A)Only one locus is associated with the trait.
B)Several loci are associated with the trait.
C)Environment plays no role in the final phenotype.
D)Only one locus is associated with the trait,and environment interacts with this locus to produce the final phenotype.
E)None of the answer options are correct.
Q2) An individual plant is heterozygous for loci that affect height and have a strictly additive mode of action.If this plant is selfed,:
a)how many height classes will there be among the progeny? (Assume no environmental effects.)
b)what will be the frequency of the tallest class of progeny? (Assume no environmental effects.)
Q3) a)What is the role of marker genes for the identification of quantitative trait loci? b)How do they differ from candidate genes?
To view all questions and flashcards with answers, click on the resource link above.
21
Chapter 20: Evolution of Genes and Traits
Available Study Resources on Quizplus for this Chatper
54 Verified Questions
54 Flashcards
Source URL: https://quizplus.com/quiz/72470
Sample Questions
Q1) Based on your knowledge of the endogenous causes of mutation,what features of an organism's phenotype or ecology should affect the molecular clock?
Q2) The molecular basis of sickle cell hemoglobin is:
A)a frameshift mutation.
B)a single nucleotide substitution.
C)a translocation event.
D)a virus induced inversion.
E)exposure to a chemical mutagen.
Q3) A key step in the generation of new genes appears to be increases in the number of copies of existing genes.Define the mechanisms that can increase the copy number of a particular gene.
Q4) In E.coli,the mutation of beta-lactamase in response to cefotaxime exposure involved five changes in the gene sequence,which can be accomplished through __________ different orderings.
A)16
B)32
C)64
D)120
E)240
To view all questions and flashcards with answers, click on the resource link above. Page 22