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Use the Following Information When Answering the Corresponding Question(s)

question 2

Multiple Choice

Use the following information when answering the corresponding question(s) .
About 3 million years ago,the Isthmus of Panama (a narrow strip of land connecting North and South America) formed,dividing marine organisms into Pacific and Caribbean populations.Researchers have examined species of snapping shrimp on both sides of the isthmus.Based on the morphospecies concept,there appeared to be seven pairs of species,with one species of each pair in the Pacific and the other in the Caribbean.The different species pairs live at somewhat different depths in the ocean.Using mitochondrial DNA sequences,the researchers estimated phylogenies and found that each of these species pairs,separated by the isthmus,were indeed each other's closest relatives.The researchers investigated mating in the lab and found that many species pairs were not very interested in courting with each other,and any that did mate almost never produced fertile offspring.(N.Knowlton,L.A.Weigt,L.A.Solorzano,D.K.Mills,and E.Bermingham.1993.Divergence in proteins,mitochondrial DNA,and reproductive incompatibility across the Isthmus of Panama.Science 260:1629-32. )
-Which of the following describes the most likely order of events in speciation?

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