In areas surrounding historic copper mines, the soil contains high, toxic concentrations of copper ions. While most populations of the grass Agrostis capillaris are unable to grow in these soils, some populations living directly on the mine waste are highly tolerant to copper.
Use your knowledge of natural selection and inheritance to explain how a copper-tolerant population of Agrostis capillaris has evolved in these contaminated areas.
66 exam-style questions on Edexcel IGCSE Biology Inheritance. Each one has a worked solution and a mark scheme showing where the marks go.