Which trisomy causes Down syndrome?
Answer and explanation
Correct answer: B. Trisomy 21
- Step 1: Down syndrome is caused by an extra chromosome 21.
- Step 2: It is associated with atrioventricular septal defects.
Answer
Trisomy 21.
Why not the others: Trisomy 18 is Edwards, trisomy 13 is Patau and monosomy X is Turner syndrome.
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