BIOL 2P05 Lecture Notes - Lecture 1: Gene Duplication, Fossil, Gram-Positive Bacteria
5 Apr 2017
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Document Summary
Dinosaur family tree might be uprooted by new fossil study! Bacteria and humans have been swapping dna for milennia. If you look at your dna you can find bacterial dna. Means you have bacterial dna in your genome long after your common ancestor. 470 billion years ago, all vertebrates had 1 particular receptor. Homologs: two genes that descended form a single common ancestral gene after speciation events. Homologs have common origins but may or may not have common function. Eg: one gene in common ancestor of apes and now one version in humans and one version in chimps. No restriction on whether they will have the same function. They may or may not have the same function. Normally, orthologs retain the same function in the course of evolution. Eg: globins duplicated in our genome. (alpha, beta) alpha in mouse and alpha in mouse are homologs!
