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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, 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.
-You find a plant that is larger than others in your wheat field. When you examine the chromosomes of this plant during cell division, you observe that the cells have double chromosome numbers of the other wheat plants. You conclude that this is an autopolyploid plant representing a new biological species in your wheat field when you observe

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The observation of double chromosome numbers in the autopolyploid plant suggests that it has undergone genome duplication, resulting in a tetraploid organism. If the tetraploid plant is fertile and can self-pollinate to produce viable offspring, it is likely that it represents a new biological species. This is because the offspring of self-pollinating tetraploid plants will also be tetraploid, and thus reproductively isolated from diploid wheat plants. The other choices (B, C, and D) do not apply to the scenario presented in the question.

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