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This Concept Map, created with IHMC CmapTools, has information related to: Untitled, 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., Postzygotic ???? Reduced Hybrid Fertility, The Origin of Species ???? Allopatric Speciation, Postzygotic ???? Reduced Hybrid Viability, Prezygotic ???? Behavorial Isolation, Prezygotic ???? Temporal Isolation, Allopatric Speciation Examples Fish, Prezygotic ???? Gametic Isolation, If factors act before or after fertilization After Postzygotic, Allopatric Speciation Example Monkeys, The Origin of Species ???? Sympatric Speciation, Sympatric Speciation This can occur due to polyploidy, habitat differentiation, and sexual selection., Prezygotic ???? Mechanical Isolation, Sympatric Speciation Punctuated Equilibrium, Reproductive Isolation classified by If factors act before or after fertilization, If factors act before or after fertilization Before Prezygotic, Allopatric Speciation Definition In allopatric speciation, gene flow is interrupted or reduced when a population is divided into geographically isolated subpopulations by a barrier., Prezygotic ???? Habitat 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., In allopatric speciation, gene flow is interrupted or reduced when a population is divided into geographically isolated subpopulations by a barrier. ???? Once separated, populations may evolve independently through mutation, natural selection, and genetic drift.