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The condition resulting from an additional copy of chromosome 21, leading to a total of 47 chromosomes in an individual, is known as:

1. Turner syndrome
2. Down syndrome
3. Klinefelter syndrome
4. Edward syndrome

Correct answer: Down syndrome

Solution

Down's syndrome is caused by trisomy of chromosome 21, leading to a total of 47 chromosomes in the affected individual. This is a well-established genetic disorder.

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