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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2003
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Q)

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 :-


( A ) 50%
( B ) 100%
( C ) 75%
( D ) 25%

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