A population of beetles contained pale and dark beetles before tree bark became darker. After several generations, dark beetles were more common. Beetles do not change colour during their lives.
Which explanation agrees with Darwin's theory?
Darker bark caused new dark variants, which then produced more surviving offspring.
Dark beetles escaped more predators, so they passed their colour to more offspring.
Pale beetles produced dark offspring, because their offspring needed better camouflage.
Dark beetles survived for longer, so their colour spread without any further reproduction.
40 exam-style questions on AQA GCSE Biology 6.3 The development of understanding of genetics and evolution, covering 6.3.1 Theory of evolution, 6.3.2 Speciation, 6.3.3 The understanding of genetics, 6.3.4 Evidence for evolution, 6.3.5 Fossils, 6.3.6 Extinction, and 6.3.7 Resistant bacteria. Each one has a worked solution and a mark scheme showing where the marks go.