Biology 1001A Lecture Notes - Lecture 18: Lipid Bilayer, Cell Membrane, Hominidae
27 Dec 2015
School
Department
Course
Professor
Document Summary
Many species in a genus: many genera in a family. Many orders in a class: many orders in a phylum. Universal common descent and origin of species: every living thing has descended from a common ancestor. Similarities due to descent from a common ancestor: cell membrane lipid bilayer structure, every cellular organism has a dna genome, luca (last universal common ancestor, many mrcas, one for each grouping. Reverse tour of evolutionary history: start at present day and climb down the tree of life. 8. 7 million other species doing the same thing: branching points on tree of life-> rendezvous points, at each point, meet other species and the group"s mrca, number should double each generation. By 30 generations 2^30 ancestors (>1 billion: at some point, pedigrees collapse. 6 million years ago: we are not descended from chimps; we share a common ancestor with them. Rendezvous 3: orangutans: mrca of african great apes, mrca of all great apes.
