Biology 9700 · AS & A Level · Natural and artificial selection
Natural and artificial selection — practice question
Hippocampus, the seahorse, is a small and unusual fish. It produces live young, and the male rather than the female is the one that becomes pregnant. Fig. 1.1 shows a seahorse.
(a(i))[2]
Sketch a graph on the axes below to show how the size distribution of seahorses is affected by disruptive selection.
(a(ii))[3]
Explain why disruptive selection has continued to be maintained in this species of seahorse.
(a(iii))[1]
State the name of the type of selection in which variation in a characteristic is kept in its existing form over time.
(b)[2]
Suggest how these two different Hippocampus species may have arisen.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A pair of peaks” …