ReNEET 2026 · Biology · Q138Principles of Inheritance and VariationIn our bank: Strong match · 86%
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. Choose the correct answer:
- A.Both Statement I and Statement II are correct
- B.Both Statement I and Statement II are incorrect✓
- C.Statement I is correct but Statement II is incorrect
- D.Statement I is incorrect but Statement II is correct
Correct Answer
(B) Both Statement I and Statement II are incorrect
Solution & Explanation
The two statements have the causes swapped. Down's syndrome is caused by an ADDITIONAL copy of chromosome 21 (trisomy 21). Turner's syndrome is caused by the ABSENCE of one X-chromosome (45, X0). So both statements are incorrect.
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