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Use the Following Information to Answer the Question

question 14

Multiple Choice

Use the following information to answer the question.
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 morphological species 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.
-If the isthmus formed gradually rather than suddenly, what pattern of genetic divergence would you expect to find in these species pairs?

Definitions:

Hostility

Feelings or acts of opposition, aggression, or animosity towards individuals or groups.

Spatial Separation

The physical distancing between groups or areas, often leading to social segregation or differences in access to resources.

Institutional Separation

The division of societal structures or organizations into distinct entities, often to maintain independence or for the purpose of specializing in different areas.

Segregation

Involves the spatial and institutional separation of racial or ethnic groups.