EvolutionEasy
Question
Along the length of a river exists a species of Catla fish. In order to provide electricity to the adjoining villages, a hydroelectric dam is built that separates the lower river area from a newly formed lake above. After many, many years, the Catla fish in the river and lake are sampled and found to be phenotypically very different. Which of the scenarios listed below is the best hypothesis to explain the observed changes?
Options
A.The presence of the dam increased the amount of random mating that occurred between the river and lake fish, and natural selection selected for the best-fit organisms in both the populations.
B. The newly built dam caused a genetic drift and the two different founder populations diverged extensively leading to the appearance of two different species
C.The electricity produced in the dam caused mutations in the river fish, and natural selection selected for the best-fit organisms in both locations.
D.The dam caused different environmental conditions to be formed in the lake versus the river, populations accumulated mutations, and natural selection selected for the best-fit organisms, which survived in both environments.
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