BIOA01H3 Chapter Notes - Chapter 22: Reproductive Isolation, Disruptive Selection, Allopatric Speciation

• School: UTSC
• Department: Biological Sciences
• Course: BIOA01H3
• Professor: Mark Fitzpatrick

Document Summary

Speciation: the development of reproductive isolation between populations. Partially reproductive isolation: they are not two separate species; however, the genetic differences are significant enough that the offspring are not as fit as the parents. Allopatric: populations that are geographically separated from each other: dispersal: colonizing a new land (an island) away from the main population source, peripatric speciation: when individuals from the mainland population move to new locations and evolve separately. This results in an island population: genetic divergence occurs faster in smaller populations, the ancestor of the galapagos finches arrived from mainland south. America to the galapagos island evolving to become a new species. The population of seals had become isolated through a vicariance event. Bioa01: subspecies: through allopatric speciation populations have acquired few population specific traits (can still interbreed). In the presence of disruptive selection, with gene flow, speciation can occur if the hybrid offspring produced is less fit for the environment through natural selection.