AP BIOLOGY

Detailed explanation-1: -Speciation is the process by which new species form. It occurs when groups in a species become reproductively isolated and diverge. In allopatric speciation, groups from an ancestral population evolve into separate species due to a period of geographical separation.

Detailed explanation-2: -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-3: -The central idea here is that when populations are geographically separated, they will diverge from one another, both in the way they look and genetically. These changes might occur by natural selection or by random chance (i.e., genetic drift), and in both cases result in reproductive isolation.

Detailed explanation-4: -Explanation: Allopatric speciation refers to the process by which a physical barrier separates a single population, causing two (or more) populations to arise and evolve due to environmental differences to become different species.

Detailed explanation-5: -Ecological theory predicts that small or isolated populations are most likely to decline and become extinct, due in part to the effects of environmental and demographic stochasticity.