NEET2013Botany-Genetics
NEET 2013 Botany Chromosomal Disorders MCQ Question
Type: MCQ-conceptual-Medium-Class 12
Down's syndrome in humans is due to:
A
Three 'X' chromosomes
B
Three copies of chromosome 21
C
Monosomy
D
Two 'Y' chromosomes
Correct Answer
Option B
Detailed Explanation
Down's syndrome is caused by trisomy 21, where there are three copies of chromosome 21 instead of the usual two.
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