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This Concept Map, created with IHMC CmapTools, has information related to: The Origin of Species Group 1, The Origin of Species ???? The Biological Species Concept, Reproductive Isolation classified by If factors act before or after fertilization, Allopatric Speciation Definition In allopatric speciation, gene flow is interrupted or reduced when a population is divided into geographically isolated subpopulations by a barrier., The Origin of Species ???? Sympatric Speciation, The Biological Species Concept focuses on Reproductive Isolation, Prezygotic ???? Gametic Isolation, Punctuated Equilibrium The way a snail's spiral on it's shell is an example of this. When their spiral goes the other way the snail can not reproduce because their genitals are going the opposite direction., Prezygotic ???? Mechanical Isolation, Postzygotic ???? Hybrid Breakdown, The way a snail's spiral on it's shell is an example of this. When their spiral goes the other way the snail can not reproduce because their genitals are going the opposite direction. This causes reproductive isolation because these two snails can not mate., Allopatric Speciation Example Monkeys, Prezygotic ???? Habitat Isolation, Postzygotic ???? Reduced Hybrid Fertility, If factors act before or after fertilization Before Prezygotic, Postzygotic ???? Reduced Hybrid Viability, The Origin of Species ???? Allopatric Speciation, Sympatric Speciation It can occur rapidly or slowly and can result from changes in few or many genes., Sympatric Speciation This can occur due to polyploidy, habitat differentiation, and sexual selection., Allopatric Speciation Evidence Areas with more barriers tend to have a larger variety of species rather than areas with fewer barriers, Sympatric Speciation Punctuated Equilibrium