上泽充通大￥ Shanghai Jiao Tong University 1896 1920 1987 2006 Lecture 16-2 Microbial Evolution and Systematics 微生物进化与系统分类 Chapter 16 in BROCK BIOLOGY OF MICROORGANISMS GH Chen Feng School of Life Science and Technology Shanghai Jiao Tong University http://micro.sjtu.edu.cn
1896 1920 1987 2006 Lecture 16-2 Microbial Evolution and Systematics 微生物进化与系统分类 Chapter 16 in BROCK BIOLOGY OF MICROORGANISMS Chen Feng School of Life Science and Technology, Shanghai Jiao Tong University http://micro.sjtu.edu.cn
上泽充通大￥ Shanghai Jiao Tong University 1896 1920 1987 2006 。© II.MICROBIAL EVOLUTION 月 CUAGUALIAO IONG UNIVEG
1896 1920 1987 2006 II. MICROBIAL EVOLUTION
12.5 The Evolutionary Process演化过程 Adaptive mutations are those that improve the fitness of an organism,increasing its survival capacity or reproductive success compared with that of competing organisms. Chen Feng,Shanghai Jiao Tong University
Chen Feng, Shanghai Jiao Tong University 12.5 The Evolutionary Process演化过程 Adaptive mutations are those that improve the fitness of an organism, increasing its survival capacity or reproductive success compared with that of competing organisms
Selection and the Rapidity of Evolution in Prokaryotes Wild-type cell Pigment mutants Light 15 -Dark Mutants lost in 10 light 部8 Mutant Cell populations selected in dark Pigment mutants 5 Wild 1 2 3 45 type P880 pooo 5 10 15 20 Subculture number 2012 Pearson Education.inc Chen Feng,Shanghai Jiao Tong University
Chen Feng, Shanghai Jiao Tong University Selection and the Rapidity of Evolution in Prokaryotes
11.6 Evolutionary Analysis:Theoretial Aspects Evolutionary chronometer-a molecule,such as rRNA, whose molecular sequence can be used as a comparative measure of evolutionary divergence. 分子序列可代表相对演化分岐的分子，如RNA,可作为演 化指针。 Criteria for being chronometers 1.Universal distribution across the group chosen for study广泛分布 2.Functionally homologous in each organisms.功能同源 3.Can be properly aligned to in order to identify sequence homology and variance.线性 4.Should change at a rate commensurate with the evolutionary distance measured.与进化距离相称的变化速率 Chen Feng,Shanghai Jiao Tong University
Chen Feng, Shanghai Jiao Tong University 11.6 Evolutionary Analysis: Theoretial Aspects Evolutionary chronometer- a molecule, such as rRNA, whose molecular sequence can be used as a comparative measure of evolutionary divergence. 分子序列可代表相对演化分岐的分子,如rRNA，可作为演 化指针。 Criteria for being chronometers 1. Universal distribution across the group chosen for study广泛分布 2. Functionally homologous in each organisms功能同源 3. Can be properly aligned to in order to identify sequence homology and variance. 线性 4. Should change at a rate commensurate with the evolutionary distance measured.与进化距离相称的变化速率