Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring...

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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 AIPMT 2003
(a) \( 100 \% \)
(b) \( 75 \% \)
(c) \( 50 \% \)
(d) \( 25 \% \)
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