Scientists compare populations of mosquitoes from treated and untreated areas. Resistance is more common in treated areas. Which additional result would most strongly support an inherited basis for resistance?
Adults collected from treated areas contain traces of the insecticide.
Adults collected from untreated areas encounter different environmental temperatures.
Offspring raised without insecticide retain differences in insecticide resistance.
Offspring raised without insecticide all develop identical levels of resistance.
44 exam-style questions on Edexcel GCSE Biology 4.1 Evolution and natural selection, covering 4.1.1 Work of Darwin and Wallace and 4.1.2 Resistant organisms and evolution. Each one has a worked solution and a mark scheme showing where the marks go.