Down's syndrome is caused by an extra copy of chromosome number 21. Wh – McqOptions

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1.	Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder [CBSE PMT 2003]
A.	0.25
B.	1
C.	0.75
D.	0.5
Answer» E.

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