I.The Evolution of Genomes Homologous:related in sequence to an extent that implies common genetic ancestry @Gene families:groups of gene homologs基因家族 Paralogs:genes within an organism whose similarity to one or more genes in the same organism is the result of gene duplication旁系同源 Orthologs:genes found in one organism that are similar to those in another organism but differ because of speciation 直系同源：起源于不同物种的最近的共同祖先的一些基因。 Chen Feng,Lecture of MicrobiologyChen Feng, Lecture of Microbiology III. The Evolution of Genomes Homologous: related in sequence to an extent that implies common genetic ancestry Gene families: groups of gene homologs基因家族 Paralogs: genes within an organism whose similarity to one or more genes in the same organism is the result of gene duplication旁系同源 Orthologs: genes found in one organism that are similar to those in another organism but differ because of speciation 直系同源：起源于不同物种的最近的共同祖先的一些基因