If allopatric speciation is the most prevalent mode of speciation, what do you predict about the geographic distributions of many closely related species? Does your answer differ for species that are sedentary versus species that are highly mobile?

They will evolve independently.

Explanation:

Allopatric speciation is also known as geographical speciation. It is a type of speciation that happens when there is the isolation of the same species of organism within a population from one another which gets to a level in which it affects their gene flow. This isolation is as a result of geographical changes like, shifting of the continents, mountain building, it could also be due to social changes like emigration.

It is likely that the emergence of geographical barriers among populations (such as for example, rivers, mountains, etc.) were responsible for the isolation of these species.

Explanation:

The presence of geographical barriers among populations ensure that they begin to evolve independently and mechanisms of reproductive isolation will appear among them