BI301 Lecture Notes - Lecture 12: Ecotype, Mutation, Sharp-Beaked Ground Finch
Document Summary
Mechanisms of speciation: allopatric speciation, parapatric speciation, sympatric speciation, polyploidy, the formation of new species that occurs when populations are. Allopatric speciation geographically isolated: divergence of populations into separate species as a result of geographic isolation from one another, allo = other different , patria = country fatherland , key points & examples, a special case of allopatric speciation. Changes are driven by genetic drift and/or natural selection. Example #1: madacasgar endemic subfamily of frogs. Example #2: galapagos finches, tortoises: allopatric speciation via vicariance. Tectonic, eustatic, climatic, or oceanographic (teco) events that result in the geographic isolation of previously connected populations. Isolation of a continental island by rising sea levels (eustatic event) Isolation of a continental island by tectonic plate movements (tectonic event) Separation & isolation of ocean basins because of the drifting together of landmasses (tectonic + Tectonic events as shown in maps a to d on slide.
