Mexican Tetra Cavefish Experiment
CAT 2025 Slot 2 · Verbal Ability & Reading Comprehension · Medium · VARC
This is a medium Verbal Ability & Reading Comprehension question from the CAT 2025 Slot 2 paper. It tests VARC. The full answer key and a step-by-step explanation are below — try it yourself first, then reveal the solution.
Based on the passage on Mexican tetra cavefish:
Which one of the following results for the cross between surface fish (with eyes) and cavefish (without eyes) would invalidate Riddle's inference from the experiment?
- A.
Some offspring with eyes had white fat.
- B.
Some offspring with eyes had yellow fat.
- C.
Some eyeless offspring had white fat.
- D.
Only eyeless offspring had yellow fat.
D
Explanation
Riddle inferred that there was no link between eye presence/size and the accumulation of carotenoids (which cause yellow fat). If only eyeless offspring had yellow fat, it would demonstrate a direct genetic linkage between eyelessness and yellow fat, thereby invalidating her inference that they are unlinked.
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