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Question #46112
The Question
An aneuploid mutation in a developing chordate embryo specifically inhibits the morphogenetic signaling required for the outpocketing of the archenteron. Which of the following statements correctly identifies the direct developmental failure and its systemic consequence?
Options
- A.
The embryo fails to undergo schizocoely, preventing the formation of a perivisceral cavity and leading to a loss of internal organ buffering.
- B.
The embryo fails to undergo enterocoely, resulting in the absence of a true mesoderm-lined perivisceral cavity, which compromises visceral homeostasis.
- C.
The mesoderm splits asymmetrically, resulting in a pseudocoelom where the blastocoel persists, mimicking the developmental pattern of Aschelminthes.
- D.
The embryo defaults to a diploblastic body plan because the failure of archenteron outpocketing completely prevents the formation of the endoderm.
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
Blastula|Gastrulation|Mesoderm_Formation
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The question tests the ability to distinguish between the two developmental origins of a true coelom (Schizocoely in protostomes vs.
Enterocoely in deuterostomes) and links this embryological fact to its physiological function (homeostasis/buffering).
The primary trap is Option A, which correctly identifies the functional loss but uses the wrong morphogenetic process (schizocoely) for a chordate.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Coelom Categorization |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |