Knowledge Organiser
This topic summary covers Knowledge Organiser within Genetic Engineering for GCSE Biology. Genetic modification, gene therapy, and biotechnology applications It is section 10 of 11 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 10 of 11
Practice
25 questions
Recall
20 flashcards
Knowledge Organiser
Key Terms
- Genetic engineering — directly altering an organism's DNA
- Restriction enzyme — molecular scissors, cuts at specific sequence
- Ligase — molecular glue, joins DNA fragments
- Sticky ends — single-stranded overhangs from restriction enzyme cuts
- Vector — carrier (plasmid or virus) for the gene
- Plasmid — small circular bacterial DNA, used as vector
- GM organism — has foreign gene inserted into its genome
- Transformation — process of bacteria taking up the plasmid
CLIP Steps
- Cut — restriction enzyme cuts out the desired gene
- Ligase — seals the gene into the vector plasmid
- Insert — recombinant plasmid transferred into bacteria
- Produce — bacteria express the gene and make the protein
Examples
- Insulin — human gene in bacteria, treats type 1 diabetes
- Golden rice — beta-carotene gene in rice, vitamin A source
- GM crops — herbicide/pest resistance genes inserted
- Gene therapy — functional gene replaces faulty one in patients
GM Crops: Key Arguments
- For: higher yield, vitamin enrichment, less pesticide
- Against: gene spread to wild plants, unknown ecology, ethics
- Safety: no evidence current approved GM crops harm health
- Debate is mainly environmental and ethical, not health-based
Common Mistakes
- Swapping restriction enzyme and ligase roles: Restriction enzyme CUTS; ligase JOINS. Never say "restriction enzyme inserts the gene" or "ligase cuts the plasmid" — these are the most penalised errors on this topic.
- Forgetting why the same restriction enzyme must be used for both cuts: The same enzyme is used to cut the gene and the plasmid so that both produce complementary sticky ends that can base-pair and be joined by ligase.
- Describing GM as the same as selective breeding: Genetic engineering moves a specific gene between unrelated species in one step; selective breeding works within a species over many generations — they are fundamentally different processes.
- One-sided GM crop evaluations: Evaluate questions require balanced arguments (advantages AND disadvantages) plus a justified conclusion — a one-sided answer cannot reach the top mark bands.
Revise this topic interactively on PrepWise — self-test mode, tap-to-reveal definitions, and Common Mistakes from examiners.
Try the interactive Knowledge Organiser — free →Keep building this topic
Read this section alongside the surrounding pages in Genetic Engineering. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Genetic Engineering
Which of the following is a benefit of genetic engineering?
A genetic engineer uses a gene from one organism to introduce a desirable characteristic into another organism. This process is an example of which type of genetic engineering?
Quick Recall Flashcards
25 questions on Genetic Engineering — practise free
Instant marking, adaptive difficulty, and 20 spaced repetition flashcards. Free until your GCSEs.
Try PrepWise Free