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Question #45274
The Question
In an experimental study, a mutation is introduced into the root apical meristem (RAM) of a dicot plant, aberrantly triggering the expression of genes responsible for synaptonemal complex formation and the terminalization of chiasmata. Based on the principles of cell cycle regulation and plant development, which of the following is the most likely consequence of this mutation?
Options
- A.
The RAM cells will undergo rapid dedifferentiation to form secondary meristems, as terminalization promotes cellular plasticity.
- B.
The cells will bypass the mitotic spindle checkpoint, leading to aberrant chromatid segregation, loss of totipotency, and the formation of disorganized tumorigenic masses.
- C.
The RAM will successfully complete reductional division, forming stable haploid root cells that exhibit increased vigor due to genetic recombination.
- D.
The meristematic cells will permanently arrest in the G2 phase of the cell cycle, leading to the immediate cessation of root elongation without any cell mass formation.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Terminalization of Chiasmata|Meristematic Totipotency|Differentiation vs Dedifferentiation
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often rigidly compartmentalize mitosis (somatic cells) and meiosis (meiocytes) without considering the molecular consequences of their overlap.
The common misconception is assuming that activating meiotic genes in roots will either simply stop growth (G2 arrest) or magically create haploid roots.
The reality of cell cycle dysregulation—specifically forcing meiotic chromatin condensation in a mitotic cycle—is severe aneuploidy, loss of cellular plasticity (totipotency), and tumorigenesis, mimicking conditions like Crown Gall disease.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Cell Cycle and Cell Division - Class 11 |
| Concept | Terminalization of Chiasmata |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |