Two populations of one species of snail become separated by a new river. Which sequence describes how speciation could take place?
Isolation, then different mutations, then natural selection, then no interbreeding
Isolation, then no interbreeding, then natural selection, then different mutations
Different mutations, then no interbreeding, then isolation, then natural selection
Natural selection, then isolation, then no interbreeding, then different mutations
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.