Genetic Engineering
Scientists move genes between organisms.
About this topic
Genetic engineering moves a gene from one organism to another. Steps: cut the desired gene with restriction enzymes, insert it into a vector such as a plasmid using DNA ligase, then introduce this recombinant DNA into host cells such as bacteria. The host then makes the protein.
Insulin for diabetics is made by modified bacteria, and crops like Golden Rice have added genes. Benefits include medicines and food security, while concerns include safety, ecological effects and ethics.
Human insulin used to be extracted from pigs and cows; now the human insulin gene is cut out with restriction enzymes, spliced into a bacterial plasmid, and the bacteria multiply in fermenters making pure insulin. Golden rice carries genes to make beta-carotene to fight vitamin A deficiency, and some crops carry a gene that makes them resistant to insects or herbicides.
Benefits include higher yields and cheaper medicines; concerns include effects on wild species, corporate control of seeds and long-term safety, which are debated by scientists and the public. Restriction enzymes cut at specific sequences, often leaving sticky ends that help the gene join the plasmid. A misconception is that genetically modified foods contain genes while ordinary foods do not; all foods contain DNA.
Key ideas
- Restriction enzymes cut DNA
- Plasmids carry genes
- Insulin is made by bacteria
Quick check
Use cases: where Genetic Engineering helps
- Homework: review the key idea behind Genetic Engineering before you start a problem set.
- Exam revision: use the quick check to test whether you can recall Genetic Engineering without notes.
- Visual learning: play with the interactive lab to see how Genetic Engineering changes when you adjust its inputs.
- Teaching a friend: explain Genetic Engineering in your own words, then compare your version with the key ideas.
Biology underpins medicine, farming, conservation and biotechnology.
Frequently asked questions
What is Genetic Engineering?
Scientists move genes between organisms.
What will I learn in Genetic Engineering?
Restriction enzymes cut DNA. Plasmids carry genes. Insulin is made by bacteria.
Is Genetic Engineering part of Biology?
Yes. It is one of 150 Biology topics on LearnViz HighSchoolEdu, with 3 key ideas, a live animation and a quick check.
Does the Genetic Engineering lab work on a phone or tablet?
Yes. The animation resizes to fit your screen and supports touch, so you can drag, tap and slide with your finger.
How should I study Genetic Engineering?
Read the summary and key ideas first, play with the interactive lab to see the idea in motion, then answer the quick check. If you get a question wrong, go back to the key idea it tests.
Do I need an account, and is my progress saved?
No account is needed. Marking a topic as learned is saved in your own browser, so it stays on that device and is not sent to a server.