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Fossil evidence suggests that polar bears, Ursus maritimus, arose from grizzly bears, Ursus arctos. On average, polar bears are slightly larger than grizzly bears in size and weight. The morphological features/adaptations of polar bears make them well suited to survival in a marine environment. Interbreeding and production of fertile offspring between the two species has been recorded in captivity, and more recently in the wild.
-The biological species concept emphasized the absence of gene flow. Which alternative species concept(s)is(are)applicable to explaining the hybridization between grizzly and polar bears?

Question

Quizplus · Accepted Answer

The morphological species concept (A) is applicable to explain the similarity between grizzly and polar bears, the ecological species concept (B) is applicable to explain their adaptation to different environments, and the hybridization between grizzly and polar bears is an example of sympatric speciation, which is addressed by the biological species concept and the recognition species concept (both not listed as answer choices). Therefore, the most appropriate choice is E (all except C).

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