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A woman with 47 chromosomes due to three copies of chromosome 21 is characterized by:

1. superfemaleness
2. triploidy
3. turner's syndrome
4. down's Syndrome

Correct answer: down's Syndrome

Solution

Three copies of chromosome 21 is trisomy 21, which is Down syndrome. The other options describe different chromosomal conditions: triploidy is an extra whole set, Turner’s syndrome is monosomy X, and superfemaleness refers to XXX.

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