How does the study of homologous structures, such as the pentadactyl limb in vertebrates, provide evidence for evolution?
It shows how environmental pressures can induce identical, immediate genetic changes in unrelated species.
It demonstrates that these species share a common ancestor from which the basic anatomical plan was inherited.
It proves that organisms occupying similar ecological niches will always develop identical internal structures.
It indicates that structures are perfectly adapted to their function and do not undergo further evolutionary modifications over time.
38 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.