Describe the stages that are used to genetically modify a bacterium so that it is able to manufacture human insulin.
Insulin is a hormone that regulates blood glucose levels in humans.
Explain what is meant by the term hormone.
Traditional farming often uses selective breeding rather than genetic modification to improve crop production. Describe how selective breeding could be used to produce wheat plants with a high grain yield.
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.