Some maize plants have been genetically modified to contain a gene from the bacterium Bacillus thuringiensis (Bt).
State what is meant by genetic engineering.
The Bt gene causes the maize plants to produce a toxin.
Explain how the Bt gene benefits the farmer.
Give one reason why some people are concerned about growing Bt maize.
After several years of growing Bt maize, some insect pests were no longer killed by the toxin.
Suggest why.
44 exam-style questions on Edexcel GCSE Biology 4.3 Selective breeding and genetic modification, covering 4.3.1 Selective breeding and its impact, 4.3.2 Tissue culture, 4.3.3 Genetic engineering overview, 4.3.4 Main stages of genetic engineering, 4.3.5 Advantages and disadvantages of GM organisms, 4.3.6 Agricultural solutions for a growing population, and 4.3.7 Evaluating genetic engineering and breeding. Each one has a worked solution and a mark scheme showing where the marks go.