A road divided a wetland, isolating two populations of newts for many generations. After the road was removed, biologists examined breeding records from controlled pairings between newts from opposite sides of the former barrier.
Which record gives the strongest evidence that the two populations still belong to one species?
The paired newts produce offspring, but their fertility is not tested.
The paired newts produce offspring that later reproduce successfully.
The paired newts show courtship behaviour, but no eggs are produced.
The paired newts produce embryos, but none survive to hatch.
80 exam-style questions on AQA GCSE Biology 6.2 Variation and evolution, covering 6.2.1 Variation, 6.2.2 Evolution, 6.2.3 Selective breeding, 6.2.4 Genetic engineering, and 6.2.5 Cloning. Each one has a worked solution and a mark scheme showing where the marks go.