BIOL 1111 Chapter Notes - Chapter 24: Allopatric Speciation, Species Problem, Reproductive Isolation

• School: Temple University
• Department: Biology
• Course: BIOL 1111
• Professor: Michael Balsai

Document Summary

While darwin was exploring the galapagos islands he discovered plants and animals that seemed to be nowhere else in the world and he proposed it as the first appearance of new beings on earth. Speciation: process of splitting species into two or more species. This explains both differences and similarities between species (unity of life). Microevolution: changes in allele frequencies within one population. To determine what differences in species actually mean biologist compare the morphology (body form) differences with physiology, biochemistry, and dna sequence differences. They found that the differences correspond with one another. Speciation can happen in two ways depending on how gene flow is interrupted between populations. Allopatric speciation: population is divided geographically into subpopulations messing up gene flow. Ex: if a river changes its course and divides a population so they can no longer mingle. Can also occur when individuals colonize new isolated area and the offspring will become geographically isolated from the parents.