Question
HLPaper 1A
In DNA profiling, short tandem repeats (STRs) of DNA are used, as these vary a great deal between individuals. Some skin cells were retrieved from a crime scene. Three STR sections of the DNA from these cells, from the victim and from a suspect, were analysed and the results are shown in the table.
| STR base sequence | Number of repeats of STR base sequence | ||
|---|---|---|---|
| Victim | Skin cells at crime scene | Suspect | |
| GTCA | 10 | 5 | 30 |
| ATGG | 40 | 50 | 66 |
| ATTA | 24 | 13 | 13 |
What can be concluded from the gel electrophoresis data?
