In an aquaculture system, krill are harvested and used as feed for farmed trout.
It takes 8 kg of krill to produce 1 kg of farmed trout. Explain why 8 kg of krill only produce 1 kg of farmed trout.
Scientists are researching ways to genetically modify crops so they produce the essential fatty acids usually found in krill, reducing the need for harvesting wild krill.
Explain how enzymes are used in the process of genetic modification to insert a desired gene into a host organism's DNA.
Describe the role of a named vector in this genetic modification process.
30 exam-style questions on Edexcel IGCSE Biology Genetic modification (genetic engineering). Each one has a worked solution and a mark scheme showing where the marks go.