基因A 酶A 底物 中间产物1 基因B→酶B 基因C 酶C 中间产物2 产物 Genetic controls of meta bolism 代谢作用的遗传控制
底物 中间产物1 中间产物2 产物 酶A 酶B 酶C 基因A 基因B 基因C Genetic controls of metabolism 代谢作用的遗传控制
Variations in gene action and phenocopies基因 效应的变异与拟表型 Expressivity: Degree of expression of a trait controlled by gene. a particular gene may produce different degrees of expression in different individua表现度:某一基因型表达的 程度。 Penetrance: The percentage of individuals that show a particular phenotype among those capable of showing it. 外显率:表现某一特定表型个体的比例。 Phenocopy: An organism whose phenotype(but not genotype) has been changed by the environment to resemble the phenotype of different(mutant)organismi 表型:环境因素有时引起非遗传的表型变化
Variations in gene action and phenocopies基因 效应的变异与拟表型 ✓ Expressivity: Degree of expression of a trait controlled by gene. A particular gene may produce different degrees of expression in different individuals表现度：某一基因型表达的 程度。 ✓ Penetrance: The percentage of individuals that show a particular phenotype among those capable of showing it. 外显率：表现某一特定表型个体的比例。 ✓ Phenocopy: An organism whose phenotype (but not genotype) has been changed by the environment to resemble the phenotype of different (mutant) organism拟 表型：环境因素有时引起非遗传的表型变化
Regulation of gene expression in prokaryotes 原核生物基因表达的调节 An abbreviated pathway of gene expression in prokaryotes简述 Operons: coordinately regulated units of gene expression操纵子学说 The lactose operon in E.coli大肠杆菌 乳糖操纵子
Regulation of gene expression in prokaryotes 原核生物基因表达的调节 ➢ An abbreviated pathway of gene expression in prokaryotes 简述 ➢ Operons: coordinately regulated units of gene expression 操纵子学说 ➢ The lactose operon in E.coli 大肠杆菌 乳糖操纵子