Two populations of the same bird species have inherited variation in beak depth. A drought leaves mainly large, hard seeds on island P but small, soft seeds on island Q. Which prediction follows from natural selection?
Shallower beaks are favoured on P; deeper beaks are favoured on Q.
Deeper beaks are favoured on P; shallower beaks are favoured on Q.
Deeper beaks are favoured on both; food does not affect selection.
Shallower beaks are favoured on both; variation does not affect survival.
44 exam-style questions on Edexcel GCSE Biology 4.1 Evolution and natural selection, covering 4.1.1 Work of Darwin and Wallace and 4.1.2 Resistant organisms and evolution. Each one has a worked solution and a mark scheme showing where the marks go.