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54 beetle pollinators of a particular plant are

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____54.Beetle pollinators of a particular plant are attracted to its flowers' bright orange color.The beetles not only pollinate the flowers, but they mate while inside of the flowers. A mutantversion of the plant with red flowers becomes more common with the passage of time. A particularvariant of the beetle prefers the red flowers to the orange flowers. Over time, these two beetlevariants diverge from each other to such an extent that interbreeding is no longer possible. Whatkind of speciation has occurred in this example, and what has driven it?a.allopatric speciation, ecological isolationb.sympatric speciation, habitat differentiationc.allopatric speciation, behavioral isolationd.sympatric speciation, sexual selectione.sympatric speciation, allopolyploidy
____55.A hybrid zone is properly defined as
____56.The most likely explanation for the high rate of sympatric speciation that apparentlyexisted among the cichlids of Lake Victoria in the past is
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 yakubainhabits the island's lowlands, and is also found on the African mainland, locatedabout 200 miles away. At higher elevations, and found only on Sao Tomé, is found the very closelyrelatedDrosophila santomea. The two species can hybridize, though male hybrids are sterile. Ahybrid zone exists at middle elevations, though hybrids there are greatly outnumbered byD.santomea. Studies of the two species' nuclear genomes reveal thatD. yakubaon the island is moreclosely related to mainlandD. yakubathan toD. santomea(2n=4 in both species). Sao Tomé rosefrom the Atlantic Ocean about 14 million years ago.____57.Which of these evolutionary trees represents the situation described in the paragraphabove (NOTE:yakuba (I)represents theislandpopulation, andyakuba (M)represents themainlandpopulation)?
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