BIOLOGY 207 Lecture Notes - Lecture 3: Symbiogenesis, Nuclear Dna, Chloroplast
Document Summary
What is the origin of this prokaryote : was it a slow prokaryote that needed help so it incorporated bacteria, was it just a prokaryote with lots of inner folding happening. Homology: shared and derived trait; a trait that is derived all from one ancestor: an example of homology is the origin of mitochondria as well as nucleus and chloroplasts. What factors might shape the tree of life: environmental factors; rapid or slow, extinction events, time of origin, area of origin on the land vs in the sea, chance, intrinsic properties of species (key innovation/adaptation) Key innovation might be flight: biological interactions, symbiosis. How small organisms live with coral and do the photosynthesizing for the coral: niche opportunity. 65 mya there was a large impact on earth"s surface; corresponds with a down swing in number of families at the same time point. How are very similar organisms, like flightless bird, found on far corners of the globe.
