ANTA01H3 Lecture Notes - Lecture 4: Allopatric Speciation, Reproductive Isolation, Character Displacement
Document Summary
Anta01 lecture 4 - continuation of last week (lecture 3) 2 groups become isolated & subjected to different selection pressures (however, they can diverge in the same location as well: cadogenesis: one species branches into many new species, anagenesis: one species evolves into another new species over time. Hard to say when it/the change actually happens: types of speciation, speciation: processes where new species arise. Problems with this: it is difficult to study empirically. If 2 animals are allopatric, it means they don"t occur in the same spot: allopatric: 2 or more populations of a single species are isolated geographically and then diverge to form 2 or more new species. 2 isolated populations go through changes and randomly develop barriers to interbreed (no longer able to breed: primary form of cladogenesis, most accepted explanation for how new species arise, fits well with bsc (biological species concept)
