AP BIOLOGY

Detailed explanation-1: -The correct answer is: Behavioral isolation.

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: -A pretty common example of geographic isolation is a population migrating to an island and becoming separated from the mainland population. This stops the gene flow between the groups of organisms. Over time, the two populations become reproductively isolated and they evolve separately.

Detailed explanation-4: -Some examples of pre-zygotic barriers include temporal isolation, ecological isolation, behavioral isolation, and mechanical isolation. With temporal isolation, the two species never come into contact with each other because they are not active at the same time, or they have different mating seasons.

Detailed explanation-5: -Examples of genetic isolation are the ecological community that are secluded away from others (such as Tristan da Cunha or Pitcairn Islands), crossing of plants which produce sterile offspring, and human influence on genetic isolates through restricted breeding of dogs.