2.孟德尔的分离定律 一些概念 PGENFRATION 等位基因( allele) reem pus I )ellow ps 纯合体( homozygote) Genetic makeup: Green/Green Yellow/ Yellow Gametes 杂合体( heterozygote 表型( phenotype) FI GENERATION 基因型( genotype) Genetic make Gree ellora 45 plants with 152 plants with Gametes genetic makeup Fa GENERATON )elloranelloto
2.孟德尔的分离定律 一些概念： • 等位基因（allele) • 纯合体（homozygote) • 杂合体（heterozygote) • 表 型（phenotype) • 基因型（genotype)
测交实验( Testcross) Genotypes Two possibilities for the genotype of the green-pod plant All green I green: I yellow
测交实验（Testcross)
分离和受精是一种几率事件 Formation of an egg Formation of a sperm
分离和受精是一种几率事件
3孟德尔的自由组合定律 双性状杂交分离的两种假说的比较 a)Hypothesis: dependent assortment (b)Hypothesis: independent assortment RRYY RRYY Gametes(rex(y utes FIGENERATION 3/16 F2 Wninkled-yellow Wrinked-green
3.孟德尔的自由组合定律 双性状杂交分离的两种假说的比较
鹦鹉羽毛颜色遗传中的自由组合 a) Phenotype and genotype Green (sky-blue (black-eyed yellow) Genotype B bi Cross sections of feathers e Yellow Melanin Melanin pigment granule pigment melanin l) Mating of heterozygotes reen) Bb Bicc(Green Phenotypic 3 blues 3 yellow I white progeny
鹦鹉羽毛颜色遗传中的自由组合