character: Trisomy 21
topic: Chromosomal Abnormalities
grade: 10
subject: Biology
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character: Down Syndrome
topic: Genetic Disorders
grade: 10
subject: Biology
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character: Karyotype Analysis
topic: Chromosomal Studies
grade: 10
subject: Biology
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character: Nondisjunction
topic: Chromosomal Errors
grade: 10
subject: Biology
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