Physiology & Biochemistry · single question
Which is the most common chromosomal abnormality compatible with survival?
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Correct answer: B. Trisomy 21 (Down syndrome)
Trisomy 21 (Down syndrome): most common viable trisomy (~1/700 live births). Oral findings: macroglossia, hypodontia, delayed eruption. Trisomies 13/18: severe anomalies, high infant mortality.
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