The number of chromosomes in Down's syndrome is [CPMT 1983; CBSE PMT 2 – McqOptions

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1.	The number of chromosomes in Down's syndrome is [CPMT 1983; CBSE PMT 2005; AFMC 2005; MP PMT 2005]
A.	23rd pair with one less = 45
B.	21st pair with one more = 47
C.	17th pair with one more = 47
D.	One extra sex chromosome = 47
Answer» C. 17th pair with one more = 47

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