Museum records for one species of beetle show how many beetles had an inherited pattern of four spots. Of the beetles collected in 1960, 12% had this pattern. Of the beetles collected from the same area in 2020, 47% had this pattern. All the beetles belong to the same species.
Which conclusion is best supported by these records?
The population has not evolved, because no new species of beetle has formed.
The population has not evolved, because the change took only sixty years.
The population has evolved, because each beetle gained more spots as it grew.
The population has evolved, although all the beetles still belong to one species.
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.