Summary
Organisms carrying foreign genes stably integrated in their genome.
In depth
Methods: microinjection into pronuclei (mice), embryonic stem cells with homologous recombination (knockouts), Agrobacterium (plants). Uses: disease models, producing drugs in milk (pharming), crops.
Transgene expression depends on integration site and copy number. Knockout mice lack a gene and show its function; knock-ins insert variants. Conditional systems (Cre-lox) allow tissue-specific changes.
Example: oncomouse carries a cancer-promoting gene for research.
A transgenic organism carries a gene from another species (transgene) stably integrated in its genome and inherited by offspring. Methods include microinjection into fertilised eggs, embryonic stem cells, viral vectors and Agrobacterium in plants.
Examples include mice with human disease genes used in research, goats producing drugs in milk, GloFish with fluorescent proteins, and crops such as Bt cotton. Transgenic animals help study gene function; farm applications raise welfare and containment questions.
Example: the AquAdvantage salmon grows faster using a growth hormone gene.
Common mistake: transgenic means a foreign gene was added; a knockout mouse, where a gene is disabled, is genetically modified but not transgenic.
Frequently asked questions
What is Transgenic Organisms?
Organisms carrying foreign genes stably integrated in their genome.
Which area of biology covers Transgenic Organisms, and how advanced is it?
Transgenic Organisms is one of the 56 topics in Biotechnology & Genomics. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include Genetic Engineering, Recombinant DNA, Proteomics.
Can you give an example of Transgenic Organisms?
AquAdvantage salmon grows faster with a growth hormone gene.
What should I learn before Transgenic Organisms?
Work through the Beginner topics in Biotechnology & Genomics first, such as Biotechnology, Genetic Engineering, Selective Breeding, then return to Transgenic Organisms. Intermediate topics assume the Beginner vocabulary.
What topics are related to Transgenic Organisms?
The closest topics to Transgenic Organisms are Genetic Engineering, Recombinant DNA, Proteomics, Cloning Animals. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Transgenic Organisms?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Transgenic Organisms. To practise the whole of Biotechnology & Genomics, use the Biotechnology & Genomics quiz.
How is Transgenic Organisms different from Genetic Engineering?
Transgenic Organisms: Organisms carrying foreign genes stably integrated in their genome. Genetic Engineering: Direct alteration of an organism's genes, often by inserting DNA from another species. Read both side by side and note what each one explains.
What is a common mistake about Transgenic Organisms?
Transgenic means a foreign gene was added; a knockout mouse, where a gene is disabled, is genetically modified but not transgenic.
How should I study Transgenic Organisms step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Genetic Engineering and explain the difference aloud. Finally, take the Biotechnology & Genomics quiz and come back to this page for any question you miss.