Study Notes
Genetic modification and biotechnology involve techniques like gel electrophoresis, PCR, and cloning to manipulate DNA for various applications. These methods are used in fields such as forensic investigations, agriculture, and medicine.
- Gel electrophoresis — a technique used to separate DNA fragments by size using an electric field. Example: Used in paternity tests to compare DNA samples.
- PCR (Polymerase Chain Reaction) — a method to amplify small amounts of DNA to create large quantities for analysis. Example: Used to replicate DNA from a crime scene for forensic analysis.
- DNA profiling — involves comparing DNA sequences to identify individuals or relationships. Example: Used in criminal investigations to match suspects to evidence.
- Genetic modification — transferring genes between species to introduce new traits. Example: Producing insulin in bacteria for diabetic patients.
- Cloning — creating genetically identical organisms from a single parent cell. Example: Dolly the sheep, the first mammal cloned from an adult cell.
Exam Tips
Key Definitions to Remember
- Gel electrophoresis: Technique to separate DNA fragments by size.
- PCR: Method to amplify DNA sequences.
- DNA profiling: Comparing DNA to identify individuals.
- Genetic modification: Transferring genes between species.
- Cloning: Producing genetically identical organisms.
Common Confusions
- Confusing PCR with DNA sequencing.
- Misunderstanding the difference between genetic modification and natural selection.
Typical Exam Questions
- What is the purpose of gel electrophoresis? To separate DNA fragments by size for analysis.
- How does PCR amplify DNA? By replicating DNA sequences through repeated cycles.
- What is an example of genetic modification? Inserting a gene for insulin production into bacteria.
What Examiners Usually Test
- Understanding of the steps in gel electrophoresis and PCR.
- Applications of DNA profiling in real-world scenarios.
- Differences between cloning methods and their uses.