AP BIOLOGY

Detailed explanation-1: -Geographical isolation is a key element in allopatric speciation. If gene flow is interrupted for long enough by geographical barriers, populations can evolve independently and eventually form distinct species.

Detailed explanation-2: -Geographic isolation, or allopatry, is a term used in the study of evolution. When part of a population of a species becomes geographically isolated from the remainder, it may over time evolve characteristics different from the parent population (due to natural selection).

Detailed explanation-3: -Islands epitomize allopatric speciation, where geographic isolation causes individuals of an original species to accumulate sufficient genetic differences to prevent them breeding with each other when they are reunited.

Detailed explanation-4: -Allopatric speciation (1) occurs when a species separates into two separate groups which are isolated from one another. A physical barrier, such as a mountain range or a waterway, makes it impossible for them to breed with one another.