The Question is from neet-botany , and it was created by the author D VINOD

Question

A diploid organism has a mutation affecting the formation of the synaptonemal complex. Which of the following is the MOST likely direct consequence of this mutation during meiosis?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: [Option C]
## CONCEPT FRAMEWORK
	**Primary Concept**: Meiosis and genetic recombination
	**Related Topics**: Chromosome pairing, crossing over, genetic variation
	**Prerequisites**: Understanding of meiosis stages, synaptonemal complex function
## SOLUTION PATHWAY
**Given Information**:
		• Diploid organism with mutation
		• Affects synaptonemal complex formation
**Method & Steps**:
	1. Consider the role of the synaptonemal complex.
		Reasoning: The synaptonemal complex is essential for the proper alignment and pairing of homologous chromosomes during prophase I of meiosis.
		Formula/Rule: None applicable
	2. Analyze the consequences of a failure in the formation of the synaptonemal complex.
		Working: If homologous chromosomes cannot properly align, crossing over may be impaired or fail altogether.
		Key Point: Crossing over is crucial for genetic diversity.
	3. Determine the most direct consequence.
		Result: The most immediate effect of impaired pairing is reduced crossing over and thus decreased genetic variation during meiosis.
		Verification: This aligns with the function of the synaptonemal complex.
 ## OPTION ANALYSIS
[A] :x: Failure of homologous chromosome pairing: While this is a consequence, it is not the most direct consequence as it leads to other effects.
[B] :x: Premature separation of sister chromatids: This is not directly related to the synaptonemal complex's function.
[C] ✓: Impaired crossing over and reduced genetic variation: Correct; this is the direct consequence of the mutation affecting the synaptonemal complex.
[D] :x: Inhibition of spindle fiber formation: This is unrelated to the synaptonemal complex.
 ## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing the roles of the synaptonemal complex with other meiotic structures.
		2. Overlooking the importance of crossing over in genetic variation.
	**Quick Tips**:
		1. Remember that the synaptonemal complex is specifically involved in homologous chromosome pairing and crossing over.
		2. Genetic variation is primarily achieved through processes like crossing over, so any mutation affecting it will likely reduce variation.

D VINOD · Answer

Failure of homologous chromosome pairing

D VINOD · Answer

Premature separation of sister chromatids

D VINOD · Answer

The correct Option is "Impaired crossing over and reduced genetic variation"

D VINOD · Answer

Inhibition of spindle fiber formation

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