Peripatric speciation is a subgroup of allopatric speciation. In instances of peripatric speciation, a small portion of the population becomes genetically isolated from the main population; therefore, it becomes genetically distinct. An example of peripatric speciation is the founder effect.

Sympatric speciation refers to the evolution of a new species from a parent population without geographic isolation. The divergence into a new species requires the formation of a reproductive barrier that isolates a subset of the population from the rest, thereby blocking gene flow.

The formation of a reproductive barrier can result from polyploidy or natural selection. If a subset of a population chooses to only eat fruit that have fallen from trees while the rest climb the trees to eat, then the subset may eventually evolve different traits. Polyploidy creates a distinct genetic difference between individuals and can lead to difference phenotypes and reproductive barriers.

Allopatric literally means “other fatherland,” meaning that populations are geographically separate. Because populations are separate, they may use similar resources and be similar in structure. Allopatric populations come about due to geographic isolation, rather than behavioral isolation. Sympatric means “same fatherland,” meaning that populations are geographically overlapping and diverge due to behavioral isolation. As a result, they may also, show divergence from a common resource and original body structure. Where the two sympatric populations overlap, there is a hybrid zone. The two species may mate and produce hybrid offspring.

In cases of sympatric speciation, two distinct species diverge from the same population within the same geographic location.

In parapatric speciation, the two diverging species still have geographic contact but there is selection against genetic exchange due to a heterozygote disadvantage. Parapatric speciation differs from peripatric speciation because there is no contact between diverging populations in peripatric speciation.

Sympatric speciation occurs when a species of organisms becomes two different species whilst inhabiting the same area. Geographic barriers do not play a role in their divergence from one another. Allopatric speciation occurs because of a geographical barrier such as a mountain range. Sympathetic is not an evolutionary term and allosteric refers to specific sites on molecules in molecular biology and biochemistry.

Allopatric speciation is the correct answer. Allopatric speciation is when one species results in two species as a result of environmental barriers. In this instance, the separation of the planet is a physical barrier that leads to the Freg becoming two different species.

Allopatric speciation occurs when two groups of organisms are separated by a physical or geographic barrier. Common examples of these barriers include mountain ranges, oceans, and even large rivers. The isthmus of Panama is a prime example of a geographical barrier and it separates the Atlantic and Pacific oceans.

Certain barriers are more easily traversed by some animals than others. For instance, an animal such as a cat is more likely to be corralled by a river than a horse or dog because the latter two are known to swim more often. But a river poses no threat of isolation to a bird. Because of their mode of locomotion birds are least likely to be hindered by a geographical barrier than a snake, raccoon, or even a prehistoric human (modern globalization almost entirely eliminates human's vulnerability to allopatric speciation).

Allopatric speciation occurs when a geographical barrier, like a river, mountain, or canyon, separates members of a population. This barrier prevents the individuals on one side from reproducing with the individuals on the other. In addition, selecting forces may act differently on the two sides of the barrier. This separation eventually results in two distinct species.

Here, the only example of allopatric speciation is that regarding the squirrels separated by the river. The example with the hawks refers to sympatric speciation, where no geographical barrier exists, but speciation can still occur due to other stressors. The remaining choices do not describe speciation at all.

Sympatric speciation implies a speciation event while the populations exist within the same geographical region.

Animals moving around more often does not really explain why speciation would occur differently, and plants are not necessarily less prone to chromosomal abnormalities. In fact, plants are more likely to be able to reproduce after abnormal chromosomal inheritance (nondisjunction, polyploidy, etc.) because many can self-fertilize. Instead of wandering around to find a mate, the plant can reproduce with itself and potentially create a reproductively isolated species.