Answer:
less genetically similar; Allopatric speciation
Step-by-step explanation:
Allopatric speciation is a form of speciation in which a biological population of a species becomes isolated or divided by geographical features, thereby preventing gene flow between the divided subpopulations, which evolve differently into different new species. As a result of the forces of natural selection and genetic drift, the isolated subpopulations evolve into new species that are less genetically similar.