Down syndrome is caused by trisomy of chromosome 21 (47 chromosomes total).
Down syndrome is due to
NEET UG 2020 — Biology Genetics
2020mcqmedium
Down syndrome is due to
Official previous-year question
Verified 30 May 2026.
Options
- A
Monosomy of chromosome 21
- B
Trisomy of chromosome 21
- C
Trisomy of chromosome 18
- D
Deletion in chromosome 5
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