ANT100Y1 : ch 3_

• School: UTSG
• Department: Anthropology
• Course: ANT100Y1
• Professor: Christopher Watts

Document Summary

Macroevolution refers to large-scale changes at or above the species level, extending over a geological era, and resulting in the formation of new taxonomic groups. A single, distinct class of living creature with features that distinguish it from other species. Phylogenetic species concept (psc) a species is the smallest aggregation of (sexual) populations diagnosable by unique combination of character states. it requires a researcher to measure and analyze character states of a sample of individuals in and between populations. Allopatric speciation: some form of physical barrier causes geographic isolation and reduces gene flow between populations. The barrier only has to limit gene flow; complete isolation is not necessary. Thus, a barrier can operate in very small geographic scales for some organisms. Two major models of allopatric speciation: vicariant speciation: occurs when a physical barrier creates large, geographically separated populations, which then diverge from each other and can no longer interbreed.