COMPREHENSIVE M100 EXAM QUESTIONS WITH CORRECT ANSWERS – ULTIMATE
STUDY GUIDE (2026 UPDATED)
SECTION A: MULTIPLE CHOICE QUESTIONS (QUESTIONS 1-100)
1. What is the primary function of the M100 molecular marker in genetic studies?
A. Detection of single nucleotide polymorphisms
B. Identification of chromosomal abnormalities
C. Tracking inheritance patterns in plant breeding
D. Quantification of gene expression levels
Answer: C
Rationale: The M100 marker is specifically designed for tracking inheritance patterns in
plant breeding programs, particularly in crop improvement studies.
2. The M100 sequence is most commonly found in which organism?
A. Homo sapiens
B. Arabidopsis thaliana
C. Escherichia coli
D. Zea mays
Answer: D
Rationale: The M100 marker was originally developed and characterized in maize (Zea
mays) for genetic mapping purposes.
3. Which technique is most suitable for amplifying the M100 region?
A. Northern blotting
B. Polymerase chain reaction
C. Southern blotting
D. Western blotting
Answer: B
Rationale: PCR is the preferred method for amplifying specific DNA sequences like the
M100 marker due to its specificity and efficiency.
4. What is the expected amplicon size of the M100 marker?
A. 100 base pairs
B. 150 base pairs
C. 200 base pairs
,D. 250 base pairs
Answer: A
Rationale: The M100 marker was named for its 100 base pair amplicon size under standard
PCR conditions.
5. The M100 marker is classified as which type of molecular marker?
A. RFLP
B. SSR
C. AFLP
D. SNP
Answer: B
Rationale: M100 is a microsatellite or simple sequence repeat (SSR) marker characterized
by tandem repeats of short nucleotide motifs.
6. Which primer pair is commonly used for M100 amplification?
A. Forward: 5'-GCATCGAT-3', Reverse: 5'-TGCAGCTA-3'
B. Forward: 5'-CTAGCTAG-3', Reverse: 5'-GATCGATC-3'
C. Forward: 5'-CGATCGAT-3', Reverse: 5'-TCTAGCTA-3'
D. Forward: 5'-AGCTAGCT-3', Reverse: 5'-CGATCGAT-3'
Answer: A
Rationale: The standard M100 primer sequences are well-documented in literature for
consistent amplification.
7. What is the optimal annealing temperature for M100 PCR?
A. 55°C
B. 58°C
C. 60°C
D. 65°C
Answer: B
Rationale: The M100 primers have been optimized to work best at 58°C for specific
amplification.
8. The M100 marker exhibits which inheritance pattern?
A. Mitochondrial
B. Co-dominant
C. Dominant
D. X-linked
Answer: B
Rationale: SSR markers like M100 are co-dominant, allowing differentiation between
homozygous and heterozygous individuals.
,9. In genetic mapping, M100 is primarily used for:
A. Physical mapping
B. Linkage mapping
C. Radiation hybrid mapping
D. FISH analysis
Answer: B
Rationale: M100 is commonly used in linkage mapping to determine genetic distances
between loci.
10. The repeat motif in M100 consists of:
A. (CA)n
B. (GA)n
C. (CT)n
D. (AT)n
Answer: A
Rationale: The M100 marker contains a (CA)n dinucleotide repeat motif characteristic of
many SSR markers.
11. Which of the following is NOT a characteristic of M100?
A. High polymorphism
B. Multi-allelic nature
C. Single-copy sequence
D. Codominant inheritance
Answer: C
Rationale: M100 is a repetitive sequence, not a single-copy sequence, which is why it
exhibits high polymorphism.
12. The M100 marker is located on which chromosome in maize?
A. Chromosome 1
B. Chromosome 4
C. Chromosome 7
D. Chromosome 10
Answer: B
Rationale: The M100 marker has been mapped to chromosome 4 in the maize genome.
13. What is the primary advantage of using M100 over RFLP markers?
A. Lower cost
B. Higher reproducibility
C. Requirement for less DNA
D. All of the above
, Answer: D
Rationale: SSR markers like M100 offer multiple advantages including cost-effectiveness,
reproducibility, and minimal DNA requirements.
14. The polymorphism information content (PIC) of M100 is typically:
A. Below 0.5
B. 0.5-0.7
C. 0.7-0.9
D. Above 0.9
Answer: C
Rationale: M100 exhibits high PIC values (0.7-0.9), indicating its utility in genetic diversity
studies.
15. Which software is most commonly used for M100 data analysis?
A. SPSS
B. R
C. SAS
D. Matlab
Answer: B
Rationale: R is widely used for genetic data analysis including SSR marker data like M100.
16. The M100 marker can be used for:
A. Paternity testing
B. Varietal identification
C. Genetic diversity assessment
D. All of the above
Answer: D
Rationale: M100's polymorphic nature makes it suitable for various applications including
paternity testing, varietal identification, and diversity studies.
17. What is the typical number of alleles observed at the M100 locus?
A. 2-4
B. 5-8
C. 9-12
D. 13-16
Answer: B
Rationale: The M100 locus typically exhibits 5-8 alleles in diverse maize populations.
18. The M100 marker is most closely related to which other marker?
A. M101
STUDY GUIDE (2026 UPDATED)
SECTION A: MULTIPLE CHOICE QUESTIONS (QUESTIONS 1-100)
1. What is the primary function of the M100 molecular marker in genetic studies?
A. Detection of single nucleotide polymorphisms
B. Identification of chromosomal abnormalities
C. Tracking inheritance patterns in plant breeding
D. Quantification of gene expression levels
Answer: C
Rationale: The M100 marker is specifically designed for tracking inheritance patterns in
plant breeding programs, particularly in crop improvement studies.
2. The M100 sequence is most commonly found in which organism?
A. Homo sapiens
B. Arabidopsis thaliana
C. Escherichia coli
D. Zea mays
Answer: D
Rationale: The M100 marker was originally developed and characterized in maize (Zea
mays) for genetic mapping purposes.
3. Which technique is most suitable for amplifying the M100 region?
A. Northern blotting
B. Polymerase chain reaction
C. Southern blotting
D. Western blotting
Answer: B
Rationale: PCR is the preferred method for amplifying specific DNA sequences like the
M100 marker due to its specificity and efficiency.
4. What is the expected amplicon size of the M100 marker?
A. 100 base pairs
B. 150 base pairs
C. 200 base pairs
,D. 250 base pairs
Answer: A
Rationale: The M100 marker was named for its 100 base pair amplicon size under standard
PCR conditions.
5. The M100 marker is classified as which type of molecular marker?
A. RFLP
B. SSR
C. AFLP
D. SNP
Answer: B
Rationale: M100 is a microsatellite or simple sequence repeat (SSR) marker characterized
by tandem repeats of short nucleotide motifs.
6. Which primer pair is commonly used for M100 amplification?
A. Forward: 5'-GCATCGAT-3', Reverse: 5'-TGCAGCTA-3'
B. Forward: 5'-CTAGCTAG-3', Reverse: 5'-GATCGATC-3'
C. Forward: 5'-CGATCGAT-3', Reverse: 5'-TCTAGCTA-3'
D. Forward: 5'-AGCTAGCT-3', Reverse: 5'-CGATCGAT-3'
Answer: A
Rationale: The standard M100 primer sequences are well-documented in literature for
consistent amplification.
7. What is the optimal annealing temperature for M100 PCR?
A. 55°C
B. 58°C
C. 60°C
D. 65°C
Answer: B
Rationale: The M100 primers have been optimized to work best at 58°C for specific
amplification.
8. The M100 marker exhibits which inheritance pattern?
A. Mitochondrial
B. Co-dominant
C. Dominant
D. X-linked
Answer: B
Rationale: SSR markers like M100 are co-dominant, allowing differentiation between
homozygous and heterozygous individuals.
,9. In genetic mapping, M100 is primarily used for:
A. Physical mapping
B. Linkage mapping
C. Radiation hybrid mapping
D. FISH analysis
Answer: B
Rationale: M100 is commonly used in linkage mapping to determine genetic distances
between loci.
10. The repeat motif in M100 consists of:
A. (CA)n
B. (GA)n
C. (CT)n
D. (AT)n
Answer: A
Rationale: The M100 marker contains a (CA)n dinucleotide repeat motif characteristic of
many SSR markers.
11. Which of the following is NOT a characteristic of M100?
A. High polymorphism
B. Multi-allelic nature
C. Single-copy sequence
D. Codominant inheritance
Answer: C
Rationale: M100 is a repetitive sequence, not a single-copy sequence, which is why it
exhibits high polymorphism.
12. The M100 marker is located on which chromosome in maize?
A. Chromosome 1
B. Chromosome 4
C. Chromosome 7
D. Chromosome 10
Answer: B
Rationale: The M100 marker has been mapped to chromosome 4 in the maize genome.
13. What is the primary advantage of using M100 over RFLP markers?
A. Lower cost
B. Higher reproducibility
C. Requirement for less DNA
D. All of the above
, Answer: D
Rationale: SSR markers like M100 offer multiple advantages including cost-effectiveness,
reproducibility, and minimal DNA requirements.
14. The polymorphism information content (PIC) of M100 is typically:
A. Below 0.5
B. 0.5-0.7
C. 0.7-0.9
D. Above 0.9
Answer: C
Rationale: M100 exhibits high PIC values (0.7-0.9), indicating its utility in genetic diversity
studies.
15. Which software is most commonly used for M100 data analysis?
A. SPSS
B. R
C. SAS
D. Matlab
Answer: B
Rationale: R is widely used for genetic data analysis including SSR marker data like M100.
16. The M100 marker can be used for:
A. Paternity testing
B. Varietal identification
C. Genetic diversity assessment
D. All of the above
Answer: D
Rationale: M100's polymorphic nature makes it suitable for various applications including
paternity testing, varietal identification, and diversity studies.
17. What is the typical number of alleles observed at the M100 locus?
A. 2-4
B. 5-8
C. 9-12
D. 13-16
Answer: B
Rationale: The M100 locus typically exhibits 5-8 alleles in diverse maize populations.
18. The M100 marker is most closely related to which other marker?
A. M101
