BIOL 115 Lecture Notes - Lecture 19: Parapatric Speciation, Allopatric Speciation, Reproductive Isolation
Document Summary
Models of speciation allopatric speciation migrate as easily. Beetles are pretty much the same. come back into contact might remain separate. Bunch of beetles on a landscape, landscape varies. But something happens, a river is created impacts the gene flow of beetles, can"t. Water flow stops, then the two populations that have been evolving separately. Allopatric speciation works well with selection or drift. If sufficient reproductive barriers have not evolve, they may collapse back into. If postzygotic isolation has evolved in allopatry, hybrid matings may be punished. Reinforcement: natural selection favors the evolution prezygotic isolation one evolutionary lineage (species) by natural selection mechanisms that prevent the formation of hybrids with reduced fitness. Requires nonrandom mating based on genetic or phenotypic factors. Much less commonly observed than allopatric, but it may just be difficult to. Some pf the time it happens while two groups of organisms are in the same place: detect sympatric.
