Study Notes
Genetic modification and biotechnology involve techniques like gel electrophoresis, PCR, and cloning to manipulate DNA for various applications. These methods allow for DNA profiling, gene transfer, and the creation of genetically identical organisms known as clones.
- Gel electrophoresis — a technique used to separate DNA fragments based on size.
Example: Used in paternity tests and forensic investigations. - Polymerase Chain Reaction (PCR) — a method to amplify small amounts of DNA.
Example: Used to create billions of copies of DNA for analysis. - DNA profiling — comparing DNA samples to identify individuals.
Example: Used in crime scene investigations to match suspects. - 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 was cloned using somatic-cell nuclear transfer.
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: Creating genetically identical organisms.
Common Confusions
- Confusing PCR with DNA sequencing.
- Misunderstanding the difference between genetic modification and natural selection.
Typical Exam Questions
- What is gel electrophoresis used for? Separating DNA fragments by size.
- How does PCR amplify DNA? By doubling the DNA amount in each cycle.
- What is the purpose of DNA profiling? To compare DNA samples for identification.
What Examiners Usually Test
- Understanding of the steps in PCR and gel electrophoresis.
- Applications and implications of genetic modification.
- Differences between cloning methods and their uses.