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On the volcanic, equatorial West African island of Sao Tomé, two species of fruit fly exist. Drosophila yakuba inhabits the island's lowlands, and is also found on the African mainland, located about 200 miles away. At higher elevations, and only on Sao Tomé, is found the very closely related Drosophila santomea. The two species can hybridize, though male hybrids are sterile. A hybrid zone exists at middle elevations, but hybrids there are greatly outnumbered by D. santomea. Studies of the two species' nuclear genomes reveal that D. yakuba on the island is more closely related to mainland D. yakuba than to D. santomea (2n = 4 in both species) . Sao Tomé rose from the Atlantic Ocean about 14 million years ago.
If the low number of hybrid flies in the hybrid zone, relative to the number of D. santomea flies there, is due to the fact that hybrids are poorly adapted to conditions in the hybrid zone, and if fewer hybrid flies are produced with the passage of time, these conditions will most likely lead to ________.


Definitions:

Political Socialization

The process by which individuals acquire their political beliefs, values, and behaviors, often influenced by family, education, media, and other societal factors.

Liberalism

A political and moral philosophy based on liberty, consent of the governed, and equality before the law.

Election Districts

Geographical divisions within which voters are assigned to vote in elections, often influencing legislative representation.

Liberals

Individuals or groups advocating for policies that emphasize civil rights, democracy, and the welfare state, often supporting progressive reforms.

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