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A disease caused by an autosomal primary non-disjunction is :

1. Klinefelter's Syndrome
2. Turner's Syndrome
3. Sickle Cell Anemia
4. Down's Syndrome

Correct answer: Down's Syndrome

Solution

Down's syndrome is caused by trisomy 21, which results from autosomal nondisjunction. The other options involve sex chromosome abnormalities or a single-gene mutation, not an autosomal trisomy.

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