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10/10/2021 7:14 pm
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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?
(1) 75%
(2) 25%
(3) 50%
(4) 100%
1 Answer
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10/10/2021 7:14 pm
Correct answer: (3) 50%