BIO120H1 Chapter Notes - Chapter 7: Introduced Species, Polyploid, Sympatric Speciation

• School: UTSG
• Department: Biology
• Course: BIO120H1
• Professor: Spencer Barrett

Document Summary

Gene mutations in one species don"t pass to other species. Reproductive community is also an evolutionary community. Extinct organisms can"t be tested for reproductive compatibility (paleontologists use appearance-based species concepts instead) Pollen fails to germinate on other plants" pistil. Members of diff species have traits that prevent them from successfully interbreeding. Members of same species can interbreed readily (same gene pool) Different mating displays or pheromones (don"t find each other sexually attractive) Prefer diff habitats (don"t encounter one another) Species: a group of individuals that resemble one another more than they resemble members of other groups. Variation w/in an interbreeding group (ex. different eye colours in humans) Species: a group of interbreeding natural populations that are reproductively isolated. Species is the unit of evolution (the thing that evolves) Species are discrete clusters, not a blur of intermediates. If you can explain how reproductive barriers evolve, you"ve explained the origin of species.