BIOL 2200 Chapter Notes - Chapter 24: Species Problem, Reproductive Isolation, Allele Frequency

• School: University of Virginia
• Department: Biology
• Course: BIOL 2200
• Professor: Jessamyn Manson

Document Summary

Speciation: the process by which one species splits into two or more species. Unity of life: when one species split into two, the species that result share many characteristics because they are descended from this common ancestor. Microevolution: changes over time in allele frequencies in a population. Macroevolution: the broad pattern of evolution above the species level: the biological species concept- emphasizes the separateness of different species. A species is a group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring with members of other such groups. Where the formation of new species hinges on. The existence of biological factors (barriers) that impede members of two species from interbreeding and producing viable, fertile offspring. Hybrids: offspring that result from an interspecific mating. Prezygotic barriers: (cid:894)(cid:862)(cid:271)efore the zygote(cid:863)(cid:895) (cid:271)lo(cid:272)k fertilizatio(cid:374) fro(cid:373) o(cid:272)(cid:272)urri(cid:374)g. u(cid:272)h (cid:271)arriers typically act one of three ways.