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In the accompanying diagram, the original population of a species of fish in a small lake that lacks predators is shown at the top. After separation by a land mass, the figure at the bottom left of the diagram shows the resulting change. Each color represents a different species. Allopatric speciation occurs when gene flow is disrupted through physical isolation of the original population. Although generally less common, sympatric speciation can occur among individuals in a population living in the same area, such as seen in the bottom right of the figure. Which of the following scenarios would most likely cause sympatric speciation to occur?A) Geographic isolation occurred when the water level dropped.B) A mutation that resulted in green coloration provided camouflage.C) A predator was introduced that indiscriminately preyed upon juvenile fish.D) A mutation that resulted in green coloration affected female mate choice.
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