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Question #45273
The Question
A cytogeneticist attempts to calculate the genetic distance between two linked genes by counting the frequency of chiasmata. However, the observations were recorded during Diakinesis rather than early Diplotene. Which of the following accurately describes the consequence of this methodological error on the resulting genetic map?
Options
- A.
The genetic distance will be underestimated because terminalization reduces the observable chiasmata frequency.
- B.
The genetic distance will be overestimated because terminalization creates additional secondary chiasmata at the telomeres.
- C.
The estimation will be unaffected because the actual crossing over events were already completed during the Pachytene stage.
- D.
The recombination frequency will artificially approach 100% due to the complete separation of homologous chromosomes.
Check Your Answer
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|Recombination Frequency (RF)|Pleiotropy Logic
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize the stages of Prophase I (Pachytene for crossing over, Diplotene for chiasmata, Diakinesis for terminalization) but fail to synthesize how the dynamic movement of terminalization affects cytogenetic mapping.
The trap in Option C relies on the 'Half-Truth' that crossing over is a static, completed event by Pachytene, tricking students into thinking the physical evidence (chiasmata) also remains constant until Anaphase I.
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 |