Q55 / 180 · NEET 2026 (Re-NEET) · Botany
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 :
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 :
- AStatement I is incorrect but Statement II is correct
- BBoth Statement I and Statement II are correct
- Correct answerCBoth Statement I and Statement II are incorrect
- DStatement I is correct but Statement II is incorrect
Solution
Down's syndrome is an autosomal aneuploidy caused by the presence of an additional copy of chromosome number $21$ (Trisomy $21$). Therefore, Statement I is incorrect.
Turner's syndrome is a sex chromosomal aneuploidy caused by the absence of one of the X-chromosomes, resulting in a karyotype of $45$ with $XO$. Therefore, Statement II is also incorrect.
Both Statement I and Statement II are incorrect.
Answer: Both Statement I and Statement II are incorrect
Turner's syndrome is a sex chromosomal aneuploidy caused by the absence of one of the X-chromosomes, resulting in a karyotype of $45$ with $XO$. Therefore, Statement II is also incorrect.
Both Statement I and Statement II are incorrect.
Answer: Both Statement I and Statement II are incorrect
Hence, the correct answer is option: 'C'.