Which of the following is NOT an example of the allopatric model for speciation?

Question

Which of the following is NOT an example of the allopatric model for speciation?

A. The rise of the Isthmus of Panama isolated populations of marine organisms in the Atlantic and Pacific Oceans, eventually leading to different species on either side of the land bridge.

B. Fish populations in Death Valley that were once connected by rivers become isolated as the climate became hotter and dryer over the last 10,000 years, leaving only a few isolated springs, which now have different species of fish that share a common ancestor

C. The formation of the Grand Canyon in Arizona caused a single population of squirrels to diverge into two species, one on the north rim and another on the south rim.

D. Benthic and limnetic stickleback fish diverged within post-glacial lakes due to the presence of two niches and competition for food resources within lakes.

A. The rise of the Isthmus of Panama isolated populations of marine organisms in the Atlantic and Pacific Oceans, eventually leading to different species on either side of the land bridge.

B. Fish populations in Death Valley that were once connected by rivers become isolated as the climate became hotter and dryer over the last 10,000 years, leaving only a few isolated springs, which now have different species of fish that share a common ancestor

C. The formation of the Grand Canyon in Arizona caused a single population of squirrels to diverge into two species, one on the north rim and another on the south rim.

D. Benthic and limnetic stickleback fish diverged within post-glacial lakes due to the presence of two niches and competition for food resources within lakes.

Explanation / Answer

allopatric speciation means geographically separated single species evolves into new and distinctive traits. Option A,B and C are considered allopatric model for speciation but option D cannot be considered under this category.

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