Q: Given a scientific passage and an answer, generate a question for the given answer.
Passage: Assume that some members of a species become geographically separated from the rest of the species. If they remain separated long enough, they may evolve genetic differences. If the differences prevent them from interbreeding with members of the original species, they have evolved into a new species. Speciation that occurs in this way is called allopatric speciation . An example is described in the Figure below . Answer: interbreeding
A:
A new species is said to have evolved if separated members of a species evolve genetic differences that prevent what from occurring with the original members??