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MCQ on Epistasis
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Most Probable Number (MPN) Test
Neuroscience MCQ
191
Which of the following is an example of dominant epistasis in humans?
A:
Blood type inheritance
B:
Albinism
C:
Eye color
D:
Sickle cell anemia
192
What does a 9:7 phenotypic ratio in a dihybrid cross usually indicate?
A:
Duplicate recessive epistasis
B:
Dominant epistasis
C:
Recessive epistasis
D:
No epistasis
193
In the case of duplicate recessive epistasis, what phenotypic ratio is typically observed?
A:
9:3:3:1
B:
9:7
C:
15:1
D:
9:06:01
194
In a dominant epistatic interaction, what is the expected phenotypic ratio of a dihybrid cross?
A:
9:3:3:1
B:
12:03:01
C:
9:7
D:
15:1
195
In a recessive epistatic relationship, what phenotype is expressed?
A:
The phenotype of the epistatic gene
B:
The phenotype of the hypostatic gene
C:
A combination of both genes
D:
Only the dominant phenotype
196
Which of the following describes a recessive epistatic interaction?
A:
One gene hides the effect of another gene
B:
One gene enhances the effect of another gene
C:
Both genes are equally dominant
D:
One gene is lethal to another
197
What is epistasis?
A:
A form of gene interaction
B:
A type of mutation
C:
A DNA replication error
D:
A transcription factor
198
What is a key advantage of the MPN test over other microbiological methods?
A:
Provides results more quickly
B:
Less expensive
C:
Requires fewer technical skills
D:
Estimates bacteria without direct counting
199
How is the MPN result used in regulatory standards?
A:
To confirm the exact bacterial species
B:
To estimate bacterial concentrations for compliance
C:
To determine the bacterial strain
D:
To identify specific contamination sources
200
What is a “positive tube” in the context of the MPN test?
A:
A tube showing no bacterial growth
B:
A tube where bacteria are present
C:
A tube with contaminated sample
D:
A tube with no results
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