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Question #46169
The Question
In an experimental study, germline gene therapy is utilized on a Urochordate embryo to completely silence the genetic pathways responsible for retrogressive metamorphosis. Which of the following best describes the expected anatomical outcome in the adult organism and its taxonomic implication?
Options
- A.
The adult will retain a persistent notochord, phenotypically mirroring the fundamental archetype of Cephalochordata.
- B.
The notochord will be replaced by a cartilaginous vertebral column, demonstrating a direct evolutionary shift towards Cyclostomata.
- C.
The adult will retain a ventral solid nerve cord and post-anal tail, shifting its taxonomic affinity to higher non-chordates.
- D.
The organism will exhibit progressive metamorphosis by developing a cranium, classifying it under subphylum Vertebrata.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Evolutionary_Exception
Tackle problems where standard rules evolve or change based on specific environmental constraints.
Concepts Behind This Question
Urochordata|Cephalochordata|Gene_Therapy_Germline_vs_Somatic
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Understanding the specific anatomical losses during retrogressive metamorphosis in Urochordates and distinguishing the defining traits of Protochordate subphyla.
Common Misconception: Students often assume that retaining a notochord automatically leads to vertebrate characteristics (vertebral column/cranium), failing to realize that Vertebrata requires novel evolutionary additions, whereas Cephalochordata represents the simple persistence of the notochord.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Urochordata vs. Cephalochordata |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |