| Date | November 2012 | Marks available | 1 | Reference code | 12N.1.HL.TZ0.10 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 10 | Adapted from | N/A |
Question
What commonly causes Down syndrome in humans?
A. Non-disjunction
B. Base substitution
C. Amniocentesis
D. Gene mutation
Markscheme
A
Examiners report
N/A
Syllabus sections
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