Biology 1001A Lecture Notes - Agnatha, Hominidae, Multicellular Organism
4 Sep 2013
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Document Summary
New species are being discovered all the time. 15,000 new species all the time, so almost as fast as we"re eliminating species. Estimated 8. 7 million very gross underestimate (open to debate. 86% of earth species and 91% of ocean species await description. Only about 1 mil have scientific names. Similarities due to descent from a single common ancestor (luca) Many mrca (most recent common ancestor, at least one for each bacteria, archaea, and eukarya) Only one luca there will be a corresponding point in the phylogeny when the branching occurs (ancestor) The ancestor"s tale reverse travel through evolution. Branching points on the tree of life correspond to rendezvous points, as in. At each rendezvous point we can speculate as to the group"s mrca. Mathematical biologists modeled that the most recent common ancestor of everyone lived as recently as 3000 years ago (using math) * more common to one another than to us.
