- 01 Introduction
- 02 Biology of DNA
- 03 Practical Issues Specific to DNA Evidence
- 04 Introduction to the Forensic DNA Laboratory
- 05 Assuring Quality in DNA Testing
- 06 Understanding a Forensic DNA Lab Report
- 07 Statistics and Population Genetics
- 08 Mitochondrial DNA & Y-STR Analysis
- 09 Forensic DNA Databases
- 10 Collection of DNA Evidence from Suspects and Arrestees
- 11 Pretrial DNA Evidence Issues
- 12 Victim Issues
- 13 Trial Presentation
- 14 Postconviction DNA Cases
- 15 Emerging Trends
Principles of Forensic DNA
for Officers of the Court
for Officers of the Court
Module 2 :: Biology of DNA
Topic 2 :: Basic Biology of Forensic DNA Identity Testing
STRs (Short Tandem Repeats)
While the history of forensic DNA human identity testing dates back to 1985, the most widely used DNA markers are defined by their 'Short Tandem Repeat' (STRs) characteristics on the chromosome.
In this example, the four base repeat is ATGC:
