A) chromosome number increase in 21st pair autosome
B) chromosome number decrease in 21st pair autosome
C) chromosome number increase in 18th pair autosome
D) chromosome number decrease in 18th pair autosome
Correct Answer: A
Solution :
Down syndrome is also known as mongolism. It is due to trisomy of 21st chromosome because of non-disjunction during meiosis. Symptoms of this syndrome are mental retardation short neck and flat face. Edwards syndrome is due to trisomy of 18th pair of chromosomes.
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