孟德尔试验成功的原因 前人的试验有两个问题:没有对杂交子 代按性状分类计数和没有运用统计分析 孟德尔成功之处在于:运用假说-推理方 法,注意实验材料的选择,引入群体分 析和数量统计分析
孟德尔试验成功的原因 • 前人的试验有两个问题：没有对杂交子 代按性状分类计数和没有运用统计分析 • 孟德尔成功之处在于：运用假说-推理方 法，注意实验材料的选择，引入群体分 析和数量统计分析
Monohybrid crosses: The principle of segregation TalPand dwarf varieties are 分离定律 crossed-fertilized All progeny e tall Homozygous HOmozygous The hynd All Fl offspring progeny are efffermized are heterozygous and purple color TAng Ratio or g 2g de the F asprin will show three phenotypes in a 1: 2: 1 ratio
Monohybrid crosses: The principle of segregation 分离定律 Homozygous×Homozygous All F1 offspring are heterozygous and purple color. Ratio of 1:2:1 Tall and dwarf varieties are crossed-fertilized All progeny are tall. Tall 3: Dwarf 1
Mendels explanation for segregation对分离现象的解 Inheritant traits are determined by genes 遗传性状由基圆决 There are a pair of genes controlling a trait in a ce体细胞中有两个基因控制一个性状 A pair of gene segregate frorn each other during the formalion of gametes在性綢胞形咸中 成对的國彼踹分离 > Each gamete carries an allele每个性细胞含一个 基因 The cornoingiion of garnered is randorn 性绸洄的绪合完全机
Mendel’s explanation for segregation 对分离现象的解释 ➢ Inheritant traits are determined by genes 遗传性状由基因决定 ➢ There are a pair of genes controlling a trait in a cell体细胞中有两个基因控制一个性状 ➢ A pair of gene segregate from each other during the formation of gametes 在性细胞形成中 成对的基因彼此分离 ➢ Each gamete carries an allele 每个性细胞含一个 基因 ➢ The combination of gametes is random 性细胞的结合完全随机
Interpretation图示解释 AA×aa Gametes A a eggs 1/2A 12a sperm 12A1/4AA1/4Aa 12a1/4AA1/4aa IAA: 2Aa: laa 3
P AA×aa Gametes A a F1 Aa Eggs 1/2 A 1/2 a sperm 1/2 A 1/4 AA 1/4 Aa 1/2 a 1/4 AA 1/4 aa 1AA：2Aa：1aa 3 ： 1 Interpretation 图示解释
Glossary o Dominance: a condition in which one member of allele pair is manifested to the exclusion of the other o Recessive: a term applied to one member of an allelic lacking the ability to manifest itself when the other or dominant member is present o Genes and allele. o Homozygous and heterozygous o Genotype and phenotype o parental
Glossary o Dominance: A condition in which one member of allele pair is manifested to the exclusion of the other o Recessive: A term applied to one member of an allelic lacking the ability to manifest itself when the other or dominant member is present o Genes and allele: o Homozygous and heterozygous o Genotype and phenotype o parental