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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
Highway Train Combinations
Configurations of vehicles coupled together, often including a tractor unit and one or more trailers, used for transporting goods on highways.
Maximum Height
The tallest permissible or achievable height for a structure, vehicle, or component, often regulated for safety or operational reasons.
Highway Truck
A type of truck designed for long-distance transport, featuring characteristics suited for travel on highways such as higher speed capabilities and increased comfort features.
Trailer Flooring
The material or construction used on the floor of a trailer to offer durability, support, and resistance to elements and heavy loads.
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