The Following Questions Refer to the Description Below

question 23

Multiple Choice

The following questions refer to the description below.
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 found 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, though 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.
-Using only the information provided in the paragraph, which of these is the best initial hypothesis for how D. santomea descended from D. yakuba?

• A)geographic isolation
• B)autopolyploidy
• C)habitat differentiation
• D)sexual selection
• E)allopolyploidy

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Definitions:

Androgyny

A blend of both masculine and feminine characteristics in an individual's appearance, behavior, or identity.

Self-ratings

Self-assessments or evaluations made by individuals regarding their own performance, abilities, or attributes.

Masculine

Characteristics, behaviors, and roles traditionally associated with men and male identity in a given society.

Feminine

Characteristic qualities or behaviors traditionally associated with women, such as gentleness, empathy, and nurturing, though these can vary widely across cultures and individuals.