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 UniversityChen 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