A conservation programme plans to return a rare freshwater fish to a restored river. The breeding fish are selected from several existing populations rather than from only one population. How could this selection help the reintroduced population?
Each reintroduced fish is likely to carry every allele found in the species.
Changes caused by the restored river are likely to become inherited by the fish.
The reintroduced population is likely to contain a wider range of alleles.
Breeding fish from several populations is likely to create new alleles without mutation.
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.