ECOL 335 Lecture Notes - Lecture 3: Alphaproteobacteria, Small Cell, Plastid

• School: University of Arizona
• Department: Ecology & Evolutionary Biology
• Course: ECOL 335
• Professor: Michod & Ferriere

Document Summary

Lecture content: alternative view of the history of life, evolutionary transitions in individuality or etis, explaining etis. Just a couple thousand cells: specialized somatic and reproductive cells, elephant, ladybugs, sex is also a cooperative act, history of life viewed from different perspectives, 1. Succession of different taxonomic groups: plants, animals, standard approach, 2. Living on land, in the air: 3. Consider multicellularity: no; happened so many different times, goes on all the time, clicker: there have been uncountable number of advantageous mutations, millions of speciation events. But not an evolutionary transition in individuality: life on land; its not a change in the unit of evolution, explaining etis. Life(cid:859)s hierar(cid:272)hi(cid:272)al orga(cid:374)izatio(cid:374) suggest a hypothesis: new kinds of individuals evolve from group of existing individuals. Individuals within groups specialize in essential tasks of the group: reproduction and heritability emerge at the group level, group becomes indivisible and hence an individual, group formation, fraternal.