Lifsci 7b Xl - Working With Data: Fig 22.7 Copy Questions And Answers 100% Verified A+ Guaranteed

We interpret the pattern in Fig 22.7 as evidence of a vicariance event, the formation of the Isthmus of Panama, that split marine shrimp populations, isolating Pacific individuals from the Caribbean and vice versa, with the result that isolated populations diverged genetically to produce new species. Among the hypothetical findings listed below, which would further support this interpretation? {Ans: A phylogeny of intertidal (above water at low tide and below water at high tide) mollusks from the Pacific and Caribbean coasts of the isthmus showing a similar pattern}In a study of species at a different location, we identify five endemic species of mammals living on an island a short distance from the mainland. We also identify each species' closest relative on the mainland. Two alternative hypotheses exist to explain this group of species: i. The ancestors of the current island species dispersed from the mainland to the island and subsequently diverged on the island (dispersal). ii. The island was originally part of the mainland, but a rise in sea level caused it to become cut off, with the result that the mammals on the island diverged from the ones on the mainland (vicariance). How would you distinguish between these