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In the case of Darwin's finches, an ancestral finch species from the mainland arrived on the Galápagos Islands and soon developed into many new species via adaptive radiation. The finches did NOT undergo adaptive radiation back on the mainland. What is the most plausible biological explanation? The founder effect greatly expanded the variation in alleles in the Galápagos finch gene pool. The environment on the mainland was completely uniform. Competition from many other bird species on the mainland that was absent on the islands. Directional selection works better on islands. The ancestral mainland finch was reproductively isolated.

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Answer:

Option- C

  • Competition from many other bird species on the mainland that was absent on the islands.                                                                                            

Explanation:

  • In the case of Darwin's finches, an ancestral finch species from the mainland arrived on the Galápagos Islands and soon developed into many new species via adaptive radiation. The finches did NOT undergo adaptive radiation back on the mainland. It is due to the fact that competition from many other bird species on the mainland that was absent on the islands.

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