Class NEET 2026 ALL Q #2081
COMPETENCY BASED
APPLY
4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE
Given below are two statements:
Statement I: Down's syndrome is caused by the absence of one of the X-chromosomes.
Statement II: Turner's syndrome is caused by the presence of an additional copy of the chromosomes.
In the light of the above statements, choose the correct answer from the options given below:
(A) Statement I is incorrect but Statement II is correct
(B) Both Statement I and Statement II are correct
(C) Both Statement I and Statement II are incorrect
(D) Statement I is correct but Statement II is incorrect
Prev Finish
Correct Answer: C

AI Tutor Explanation

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Detailed Solution

Step 1: Analyze Statement I

Statement I claims Down's syndrome is caused by the absence of one X-chromosome. This is incorrect. Down's syndrome is a chromosomal disorder caused by the presence of an additional copy of chromosome number 21 (Trisomy 21).

Step 2: Analyze Statement II

Statement II claims Turner's syndrome is caused by the presence of an additional copy of chromosomes. This is incorrect. Turner's syndrome is caused by the absence of one of the X-chromosomes (45, XO), resulting in a total of 45 chromosomes.

Step 3: Conclusion

Since both statements provided in the question are factually incorrect based on the principles of human genetics, the correct choice is that both statements are incorrect.

Final Answer: Both Statement I and Statement II are incorrect

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must retrieve specific knowledge regarding chromosomal disorders and apply that knowledge to evaluate the validity of two distinct biological statements.
Knowledge Dimension: CONCEPTUAL
Justification: The question tests the understanding of genetic principles and the classification of chromosomal abnormalities rather than simple rote memorization of definitions.
Syllabus Audit: In the context of NEET, this is classified as COMPETENCY. The question format mimics the NTA pattern of Statement-based questions, requiring high precision in biological terminology and diagnostic accuracy.

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