Two sea urchin species, Echinometra lucunterand E. viridis, live off the Atlanti

Question

Two sea urchin species, Echinometra lucunterand E. viridis, live off the Atlantic coast of Panama in Central America. Another species of sea urchin, E. vanbrunti, lives off the Pacific coast of Panama. At one point in recent geologic history, Panama was underwater and there was no physical separation among these species of sea urchin. Echinometra viridis and E. vanbrunticannot successfully fertilize eggs from E. lucunter. Sperm from neither Echinometra viridis nor Echinometra vanbrunti is able to fertilize an egg from Echinometra lucunter. (Egg and sperm size in relation to each other are not to scale.) E. vanbrunti is found along the Pacific coast. E. lucunter E. viridis E. vanbrunti E. vanbrunti Egg Both E. lucunter and E. viridis are found on the Atlantic side of Panama. E. lucunter E. viridis STodd C LaJeunesse Given this information, which pair(s) below represent(s) speciation as a result of allopatric speciation? Select all that apply. Choose one or more: O A. E. lucunter and E. vanbrunti O B. E. viridis and E. vanbrunti O C. E. lucunterand E. viridis Which pair(s) below represent(s) speciation as a result of sympatric speciation? Select all that apply Choose one or more: O A. E. viridis and E. vanbrunti B. E. lucunter and E. vanbrunti O C. E. lucunterand E. viridis

Explanation / Answer

1) Options A and B are correct.

Allopatric speciation happens when one or more populations of the same species become isolated from each other due to geographic changes. In this case, E. lucuner and E. viridis got isolated from E. vanbrunti due to geographic change

2) Option C

Even though they are located in the same area, they became reproductively isolated groups which can be termed as sympatric speciation.

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