Study Notes
Genetic modification involves altering the genetic material of an organism by inserting, removing, or changing genes from another organism. This process creates genetically modified or transgenic organisms with recombinant DNA.
- Genetic Engineering — changing the genetic material of an organism by removing, changing, or inserting genes from another organism. Example: Inserting the human insulin gene into bacteria to produce insulin.
- Genetically Modified Organism (GMO) — an organism that has received genetic material from another organism. Example: Crops modified to resist pests or herbicides.
- Recombinant DNA — DNA that contains genes from different organisms. Example: Bacterial plasmids with inserted human genes.
- Restriction Enzymes — enzymes used to cut DNA at specific sites, leaving sticky ends. Example: Used to isolate the insulin gene.
- DNA Ligase — enzyme that joins DNA fragments together. Example: Links plasmid and isolated gene to form recombinant DNA.
Exam Tips
Key Definitions to Remember
- Genetic Engineering
- Genetically Modified Organism (GMO)
- Recombinant DNA
- Restriction Enzymes
- DNA Ligase
Common Confusions
- Confusing genetic modification with natural selection
- Misunderstanding the role of plasmids in bacteria
Typical Exam Questions
- What is genetic engineering? The process of altering the genetic material of an organism by inserting, removing, or changing genes.
- How are restriction enzymes used in genetic engineering? They cut DNA at specific sites, leaving sticky ends for gene insertion.
- Why are bacteria used in genetic engineering? They have plasmids, no ethical concerns, and can easily produce proteins from inserted genes.
What Examiners Usually Test
- Understanding of the genetic engineering process
- Examples of genetically modified organisms and their benefits
- The role of enzymes like restriction enzymes and DNA ligase in genetic modification