The Question is from neet-botany molecular-basis-of-inheritance mutations, and it was created by the author Mr. NARESH KUMAR K

Question

Certain mutations are referred to as 'suppressor mutations.' Which statement best describes their function?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Suppressor mutations
 **Related Topics**: Mutations, gene expression, phenotype
 **Prerequisites**: Understanding of gene function, mutation types, and their effects on phenotype.
## SOLUTION PATHWAY
**Given Information**:
The question asks for the function of suppressor mutations.
**Method & Steps**:
1. Understanding suppressor mutations:
  Reasoning: Suppressor mutations counteract the effects of another mutation.
  Formula/Rule: None
2. Analyzing the options:
  Working: Let's evaluate each option.
  Option A is incorrect because suppressor mutations don't increase the rate of other mutations.
  Option B is incorrect because suppressor mutations don't always revert the original mutation to the wild-type sequence. They can modify the effect without restoring the original sequence.
  Option C is correct because suppressor mutations counteract the phenotypic effect of a previous mutation, either in the same gene or a different gene. This is the defining characteristic of suppressor mutations.
  Option D is incorrect because suppressor mutations reduce or suppress the phenotypic effect of the original mutation, not enhance it.
 3. Selecting the correct option:
  Result: Option C accurately describes the function of suppressor mutations.
  Verification: The definition of suppressor mutations aligns perfectly with option C.
 ## OPTION ANALYSIS
A :x: This describes a different type of mutation or a mutagenic event, not a suppressor mutation.
B :x: While some suppressor mutations might lead to a reversion of the phenotype, this is not always the case.  Suppressor mutations can compensate for the effect of the original mutation without directly reversing it.
C ✓: This is the correct definition of a suppressor mutation.  They mask or suppress the phenotypic effect of a prior mutation.
D :x: This describes an enhancer mutation, which has the opposite effect of a suppressor mutation.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing suppressor mutations with revertant mutations: Revertant mutations directly reverse the original mutation to the wild-type sequence. Suppressor mutations compensate for the effects without necessarily restoring the original sequence.
  2.Thinking suppressor mutations only affect the same gene:  Suppressor mutations can occur in different genes, as long as they interact to compensate for the effect of the original mutation.
 **Quick Tips**:
  1.Remember that suppressor mutations are a secondary mutation that compensates for a primary mutation.
  2.Visualize a suppressor mutation as a 'fix' for a broken part of a system (the primary mutation).

Mr. NARESH KUMAR K · Answer

They increase the rate of other mutations within the same gene.

Mr. NARESH KUMAR K · Answer

They always revert the original mutation back to the wild-type sequence.

Mr. NARESH KUMAR K · Answer

The correct Option is "They reverse the phenotypic effect of another mutation at a different site within the same gene or a different gene."

Mr. NARESH KUMAR K · Answer

They enhance the phenotypic expression of the original mutation.

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