Texas A&M University (TAMU) BIOL112 Introductory Biology II Exam 3 Practice

Allopatric speciation is characterized by geographical barriers that divide a population, leading to the isolation of groups of the same species. This isolation prevents gene flow between the separated populations, allowing them to evolve independently over time. Through mechanisms such as natural selection and genetic drift, these populations can accumulate differences that ultimately result in the formation of new species.

Geographical barriers can include physical features like mountains, rivers, or distance that separate populations, significantly impacting their reproduction and adaptation. Because of these barriers, individuals can no longer interbreed, and the isolated populations may experience different selective pressures, leading to diverging traits and evolutionary pathways. This form of speciation is fundamental in understanding biodiversity and how new species emerge over time due to environmental factors.