Biology 1002B Lecture Notes - Lecture 20: Platypus, Meteoroid, Old World Monkey
3 Feb 2017
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New species discovered each year: 18000 new species discovered in 2016. Universal common descent and origin of species: everything on earth is related through a process of common ancestry, similarities due to descent from common ancestor. All cellular forms of life have the same molecular cells as some membranes. Homologies- similarities that arise from the common ancestry. Ancestor in which everything is tied to. 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. A point of time where one population became isolated enough that it turned into a different species. Rendezvous -> how many years back we have to take to meet up to a related species: at each point, (cid:373)eet other species, a(cid:374)d the other groups" mrcas. How many ancestors: number should double each generations.
