Botany-(general)
NEET Botany (general) MCQ Question
Type: MCQ-fact-Hard-Class 12
What is the genetic basis of Down's syndrome?
A
Presence of an additional copy of chromosome 21
B
Presence of an additional copy of chromosome 18
C
Lack of one chromosome from pair 21
D
Presence of an extra Y chromosome
Correct Answer
Option A
Detailed Explanation
Down's syndrome is caused by the presence of an additional copy of chromosome number 21, known as trisomy of 21, leading to various physical and developmental characteristics.
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