Question

which of the following describes allopatric speciation? when a physical barrier is formed that separates a population and prevents gene flow between them when a new species arises that is a hybrid of two surrounding populations when a new species arises within the current population due to behavior changes or mechanical issues

Explanation:

Allopatric speciation occurs when a physical barrier (such as a mountain range, river, or canyon) forms, separating a population into two or more groups. This separation prevents gene flow between the groups. Over time, each group may evolve independently due to different environmental pressures, genetic drift, and mutations. Eventually, these groups may become so genetically distinct that they can no longer interbreed, even if the physical barrier is removed. This process leads to the formation of new species.
The first option correctly describes this process. The second option describes hybrid speciation, which is a different process. The third option describes sympatric speciation, where a new species arises within the same geographic area as the parent population, often due to behavioral or ecological differences rather than a physical barrier.

Answer:

when a physical barrier is formed that separates a population and prevents gene flow between them