Summary
Forensics involves techniques like Polymerase Chain Reaction (PCR), Gel Electrophoresis, and DNA Profiling to analyze biological samples for identification and investigation purposes.
- Polymerase Chain Reaction (PCR) — A method to amplify DNA or RNA fragments into billions of copies. Example: Used in forensic labs to duplicate DNA from crime scenes.
- Gel Electrophoresis — A technique to separate DNA or protein fragments based on size and charge. Example: Used to analyze DNA fragments for fingerprinting.
- DNA Profiling — A technique to identify individuals by analyzing unique DNA patterns. Example: Used in paternity testing and forensic investigations.
Exam Tips
Key Definitions to Remember
- Polymerase Chain Reaction (PCR)
- Gel Electrophoresis
- DNA Profiling
Common Confusions
- Mixing up the stages of PCR
- Misunderstanding how gel electrophoresis separates molecules
Typical Exam Questions
- What are the stages of PCR? Denaturation, annealing, and extension.
- How does gel electrophoresis separate DNA fragments? By size, with smaller fragments moving further.
- What is DNA profiling used for? Identifying individuals and determining genetic relationships.
What Examiners Usually Test
- Understanding of PCR stages and their purposes
- Ability to explain the process of gel electrophoresis
- Application of DNA profiling in real-world scenarios