Florida International University PCB 2061 Perspectives on the Phylogenetic Tree 1)What is horizontal gene transfer (HGT)? What did genome fusion between symbiotic or endocymbiotic organisms result in? Where is HGT most prevalent and what % is transferred by this process? What is the Endosymbiont Theory? What are the 3 mechanisms by which genes are transferred among common bacteria? What is the most recent 4th mechanisms of gene transfer discovered? GTAs are thought to be what? In plants, how has gene transfer been observed?   What example of HGT is seen in some aphid species? What is the theory that explains the mechanism whereby eukaryotic cells obtained their mitochondria and chloroplasts? Mitochondrial DNA is inherited from whom? What is the difference between the nucleus-first hypothesis and the mitochondria-first hypothesis? In 1999, W