Human Trisomy as a Chromosomal-Disorder Example
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Trisomy 21, an extra copy of chromosome 21 from nondisjunction, is the most common human chromosomal trisomy compatible with survival to birth.
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A karyotype showing three copies of chromosome 21 instead of two, rather than any single symptom, is what confirms trisomy 21.
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This entry names a chromosome count, not a diagnosis or a health recommendation — no viewer's genetics is addressed.
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