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Lesson 9 Law of independent assortment.Dihybrids
- 1. LESSON # 9 TWO GENES UNDER STUDY
- 2. True breeding for 2 genes
- 3. Yellow (g) Green (G) Green > Yellow Genotype GGYY GGYy GGyy GgYY GgYy Ggyy ggYY ggYy ggyy Phenotype Green pod Yellow peas Green pod Yellow peas Green pod green peas Green pod Yellow peas Green pod Yellow peas Green pod green peas Yellow pod yellow peas Yellow pod yellow peas Yellow pod green peas Genes studied: Color of pea pod and Color of peas Possible alleles for color peapod: Possible genotypes and corresponding phenotypes: Yellow (Y) Green (y) Yellow > Green Possible alleles for color peas: Studying 2 genes at the same time
- 4. Punnet square: Gametes Gametes GY GY gy gy GgYy GgYy GgYy GgYy F1 Genotype 100% GgYy Phenotype 100% Plants with Green Pods and Yellow peas P: Green pod and yellow peas x Yellow pods and green peas GGYY yygg Gametes GY GY yg yg Genotype GGYY GGYy GGyy GgYY GgYy Ggyy ggYY ggYy ggyy Phenotype Green pod Yellow peas Green pod Yellow peas Green pod green peas Green pod Yellow peas Green pod Yellow peas Green pod green peas Yellow pod yellow peas Yellow pod yellow peas Yellow pod green peas Dihybrids: heterozygous for two genes studied
- 5. P: Green pod and yellow peas x Green pod and yellow peas GgYy GgYy Gametes GY Gy gY gy GY Gy gY gy Crossing Dihybrids Remember how gametes form
- 7. Punnet square: Gametes Gametes GY Gy GY Gy GGYY GGYy GGYy GGyy gygY gY gy GgYy Ggyy GgYY GgYy GgYy GgYy GgYY ggYY ggYy ggYy ggyy Ggyy Genotype GGYY GGYy GGyy GgYY GgYy Ggyy ggYY ggYy ggyy Phenotype Green pod Yellow peas Green pod Yellow peas Green pod green peas Green pod Yellow peas Green pod Yellow peas Green pod green peas Yellow pod yellow peas Yellow pod yellow peas Yellow pod green peas Possible genotypes and corresponding phenotypes: Crossing Dihybrids F1 Genotypes F1 Phenotypes p (GGYY) = 1 16 9 16 Green pod and yellow peas p (GGYy) = 2 16 p (GgYy) = 4 16 p (GgYY) = 2 16 p (GGyy) = 1 16 3 16 Green pod and green peas p (Ggyy) = 2 16 P (ggYY) = 1 16 3 16 Yellow pod and yellow peas P (ggYy) = 2 16 P (ggyy) = 1 16 1 16 Yellow pod and green peas
- 8. How many plants with green peas and how many with yellow peas? Ratio? How many plants with green pods and how many with yellow pods? Ratio?
- 9. Law of Independent Assortment Allele pairs separate independently during the formation of gametes