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Fish species that formed as a result of the closure of the Isthmus of Panama are...

Fish species that formed as a result of the closure of the Isthmus of Panama are an example of: Select one: a. The “dumbbell” (AKA vicariance) model of allopatric speciation b. The peripheral isolate model of allopatric speciation c. Sympatric speciation d. Parapatric speciation

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Answer #1

Dumbell model of allopatric speciation is a model of speciation where a population is separated in to two becaue of the formation of a mountain, water body or loss of a bridge all of which prevent the gene flow. This results in the two populations evolving separately and giving rise to two different species. So the fish species formed after the closure of panama are an example of dumbell shaped model of allopatric speciation.

Peripheral isolate model is when a peripheral population separates and forms a species.

Sympatric speciation is when new species forms with in the same population.

Paapatric speciation occurs while the populations are having gene flow.

Option 'a' is hte right one.

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