RE-NEET 2026 Botany Chromosomal Disorders Assertion Reason Question
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:
Both Statement I and Statement II are incorrect
Statement I is correct but Statement II is incorrect
Statement I is incorrect but Statement II is correct
Both Statement I and Statement II are correct
Correct Answer
Detailed Explanation
Both statements are incorrect. Down's syndrome is caused by an extra copy of chromosome 21 (trisomy 21), not the absence of an X chromosome. In contrast, Turner's syndrome results from the absence of one X chromosome (45,X), not from the presence of an additional chromosome.
Thus, the correct answer is A) Both Statement I and Statement II are incorrect.
The tempting wrong options fail because they misattribute the causes of these syndromes: Statement I incorrectly describes Down's syndrome, while Statement II incorrectly describes Turner's syndrome.
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