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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

MCQ on Epistasis
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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

MCQ on Epistasis
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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

MCQ on Epistasis
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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

MCQ on Epistasis
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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

MCQ on Epistasis
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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

MCQ on Epistasis
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197 What is epistasis?

A: A form of gene interaction

B: A type of mutation

C: A DNA replication error

D: A transcription factor

MCQ on Epistasis
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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

Most Probable Number (MPN) Test
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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

Most Probable Number (MPN) Test
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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

Most Probable Number (MPN) Test
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