Before You Begin
Question #46137
The Question
Taenia solium is a monoecious platyhelminth that exhibits internal fertilization and frequently undergoes self-fertilization. If a targeted chemical inhibitor completely blocks the activity of the recombinase enzyme during its gametogenesis, which of the following represents the most likely long-term genetic consequence for this specific lineage?
Options
- A.
Arrest of meiosis during zygotene due to the failure of synaptonemal complex formation.
- B.
Rapid accumulation of deleterious recessive alleles due to the inability to break existing linkage groups.
- C.
Enhanced evolutionary fitness due to the permanent preservation of highly adapted parental gene combinations.
- D.
Increased heterozygosity in the progeny due to compensatory independent assortment during Anaphase I.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Pachytene_Crossing_Over|Self-fertilization|Meiosis
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: This question tests the synthesis of three distinct NCERT concepts: the reproductive anatomy of Platyhelminthes (self-fertilizing hermaphrodites), the specific molecular events of Meiosis Prophase I (Recombinase in Pachytene), and the genetic consequences of inbreeding/lack of recombination.
The primary trap is Option A, which preys on students confusing the sequence of Prophase I sub-stages (Zygotene vs.
Pachytene).
Option C acts as a 'Common Half-Truth' distractor, as students often erroneously assume that preserving a parasite's exact genome is always beneficial, ignoring the long-term genetic load of deleterious mutations.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Platyhelminthes Parasitic Adaptations |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |