Speciaction and Macroevolution

Speciaction and Macroevolution - Speciaction and...

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Speciaction and Macroevolution Species isolating mechanism Biological species concept Groups of populations that are reproductively isolated from other groups of populations Members of the same species can interbreed and produce fertile offspring Some “gray areas” Reproductive isolating mechanisms Prevent successful mating Prezygotic – prevent fertilization Postzygotic – prevent gene flow when mating occurs Geographic (location), temporal (time of year), ecological (habitat), behavioral (differences in courtship rituals), mechanical (structural differences in reproductive organs), genetic (gametes are chemically incompatible) Post-zygotic isolating mechanisms Hybrid inviability Hybrid stability Hybrid breakdown o Generation has lower fitness TYPES OF SPECIATION Allopatric Speciation Species form because they have been separated. Mutation
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Sympatric Speciation Population diverging in same physical location Most important in plants Difficult to demonstrate for animals
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Speciaction and Macroevolution - Speciaction and...

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