A population of lizards on an island includes lizards with long legs and lizards with short legs. Leg length is inherited.
Which observation would show that this lizard population has evolved?
The proportion of long-legged lizards in the population increases over many generations.
The population becomes separated from lizards on a nearby island by the sea.
Long-legged lizards are more likely than short-legged lizards to escape from predators.
Long-legged and short-legged lizards are both present in every generation that is studied.
122 exam-style questions on OCR GCSE Biology 5.2 Natural selection and evolution, covering 5.2.1 Genetic variation within a population, 5.2.2 Developments in classification systems, 5.2.3 How evolution occurs through natural selection, 5.2.4 Evolution as change over time, 5.2.5 Evidence for evolution, and 5.2.6 Darwin and Wallace. Each one has a worked solution and a mark scheme showing where the marks go.