Parapatric speciation occurs when
A) selection causes a single species to develop different adaptations to a similar environment.
B) a population is divided into two reproductively isolated subgroups that form separate species.
C) a single species experiences a gradient of environmental differences within its geographic range, which result in partial genetic isolation.
D) a formerly isolated subpopulation recolonizes its home range and mates with the remaining individuals.

Question

Quizplus · Accepted Answer

Parapatric speciation occurs when a single species experiences a gradient of environmental differences within its geographic range, which result in partial genetic isolation. This type of speciation is different from allopatric speciation, where a population is physically separated into two reproductively isolated subgroups that form separate species. In parapatric speciation, the barrier to gene flow is not complete, allowing for some limited interbreeding between the two populations. Over time, the differences in the environment and the resulting differences in selective pressures lead to the evolution of distinct adaptations and eventual speciation.

Parapatric Speciation Occurs When