KROK 1 2016 – Question 141 · KROK (Medicine) · Biology
A 2-year-old boy is diagnosed with Down syndrome. What chromosomal changes can cause this disease?
- A. Trisomy 18
- B. Monosomy X
- C. Trisomy X
- D. Trisomy 13
- E. Trisomy 21
Hint
Recall which numerical chromosomal abnormality underlies this most frequent genetic cause of intellectual disability in children, and how the extra chromosome arises in meiosis.
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