Biology 1001A Lecture Notes - Lecture 4: Hominidae, Eukaryote, Extremophile
4 Dec 2015
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Document Summary
1. 2 million species of eukaryotes have names (vase majority of: approx. 7-10 million species of eukaryote that share the those are insects) earth with us. Universal common descent and origin of species: charles darwin. Every living thing on earth is related by descent from a common ancestor. Results in groups having similarities: genetic info in dna, all life composed of cells in particular, genetic code almost universal arrangement. Homology: we share traits in common because we inherited it from the same ancestor. Only one luca, many mrca"s (most recent common ancestors) one for each grouping: similarities due to descent from a single common ancestor. Rendezvous zero: mrca of all humans. All people can be traced to a certain place in time where someone was an ancestor of everyone. Based on mathematical modeling mrca of all humans would exist within the last 3000 years. We are more like distant cousins of chimpanzees: common ancestor occurs about 6 million years ago.
