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A plant species is distributed on the slopes of two mountains and in the broad valley between them. During a period of climate warming, the valley floor becomes uninhabitable to the plant, but the populations persist on the mountains and undergo speciation (Phase 1). The climate cools again and the new species come into contact (Phase 2), but the only reproductive barrier between them is hybrid inviability, a postzygotic barrier.

a) What type of speciation is occurring during Phase 1 (allopatric, parapatric or sympatric)? Explain your answer.

b) During Phase 2, would plants pollinated by members of the same species be fitter or less fit than those pollinated by the other species? Explain your answer.

c) What types of traits are likely to be favoured in this situation?

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Nestor Rutherford
Nestor RutherfordLv2
29 Sep 2019
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