LIFE SCIENCE

Detailed explanation-1: -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.

Detailed explanation-2: -Geographic isolation occurs when two populations are separated by geographic barriers such as rivers, mountains, or bodies of water. For example, the Kaibab squirrel is a subspecies of the Abert’s squirrel that formed when a small population became isolated on the north rim of the Grand Canyon.

Detailed explanation-3: -Example of Geographic Isolation Geographic isolation occurs when two populations of the same species are divided by some type of geographic event or object. This event or object physically prevents two populations from being in the same area, preventing them from mating.

Detailed explanation-4: -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-5: -In order for speciation like this to take place, gene flow between populations must be blocked. Geographic isolation occurs when gene flow is blocked because two populations are physically separated. Geographic isolation caused the origin of a new species of squirrel at the Grand Canyon.