BIOL107 Lecture Notes - Lecture 2: Eukaryote, Archaea, Hydrolysis

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL107
• Professor: A L L

Document Summary

From earliest of life forms: common ancestor of all life diverged into 3 domains, bacteria, archaea, eukarya, archaea and eukarya are more closely related to each other than they are to bacteria, archaea and bacteria however are both prokaryote, figure depicts traditional representation of origin of 3 domains obvious common ancestor with branches to the 3 domains, recent data based on sequencing of total dna of many organisms suggest a different view, dna was exchanged between organisms, infectious elements brought dna from one organism to another, fusion of organisms, uptake of dna released from dead organisms, these indefinite structures result in an inability to establish clear branches leading from one organism to another, the evolution of early organisms can best be represented by a ring structure which eliminates common ancestor and depicts community of primitive cells that exchanged dna ref fig.