| Date | May 2016 | Marks available | 1 | Reference code | 16M.1.HL.TZ0.7 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Identify | Question number | 7 | Adapted from | N/A |
Question
Which sequence of DNA would be suitable in DNA profiling?
A. ---ATTCGTGAATCAGCC--
B. ---ATTCGTGAATTTGCC--
C. ---ATTCGTGATTGCAGC--
D. ---ATTCGTGATTCGTGA--
Markscheme
D
Examiners report
This question had the greatest number of G2 comments. Although teachers believed this was an unfair question, some candidates were able to see the tandem repeats only present in answer D. This was the only answer with 7 base pair repeats (there can be between 2 and 60 base pair in a tandem repeat). It is agreed that it is possibly too short a sequence to easily see the repeats and that this could have put off some good candidates.
Syllabus sections
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