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NEET UG BIOLOGY MCQ: PRINCIPLE OF INHERITANCE AND VARIATION
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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?
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Correct option: B
Option B () is correct because the affected mother produces gametes with either an extra chromosome 21 or a normal set, leading to a 50% chance of the offspring inheriting Down's syndrome.
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