Mendelian Genetics Gregor Mendel, Augustinian Monk (Augustinians = A Catholic religious order) Mendelian Genetics Vocab: 1. Gregor Mendel 2. Dominant 3. Recessive 4. Allele 5. Phenotype 6. Genotype 7. Heterozygous 8. Homozygous Vocab 9.Monohybrid Cross 10. Dihybrid Cross 11. F1 generation 12. Law of Segregation 13. Law of Independent Assortment Mendel Video Historical Study of Genetics, video Mendel theory Video 2 Mendel Videos Pea Plant Experiments video Mendel Video..\MendelVideos\Punnett_Square__Charti ng_Dominant_and_Recessive_Traits.asf 14. Codominance = Two dominant alleles are expressed at the same time. Ex. Roan Coat in horses ( White and Red Hairs) 15. Incomplete Dominance: The phenotype of a heterozygote is intermediate . Red and white flowers produce PINK.(in Snapdragons) RR x rr = Rr (pink) Mendel’s Pea Plants Cross-pollination Pea Plants Mendelian Traits in Pea Plants Monohybrid Cross : Peas TT x tt TT ( Homozygous Dominant) crossed with tt ( Homozygous Recessive) Monohybrid Cross : Peas P Generation : TT x tt = F1 generation: Phenotype = 100 % Tall pea plants Genotype = 100 % Heterozygous , Tt Monohybrid Cross : Peas F1 : Tt x Tt = F2 Generation : Genotypes: TT, Tt, tt F2 Genotypes: TT = 25 % Tt = 50% tt = 25% ( So, the ratio is 1:2:1 ) What at the possible Phenotypes? What is the Phenotype ratio? 75% Tall, 25% short ( So, the ratio is 3:1) Corn Lab Purple is dominant (P) Yellow is recessive (p) Starchy, plump is dominant (S) Sweet, wrinkled is recessive (s) P- Generation : PP x pp =What ratios? Test Cross = Pp x pp = What ratios? Monohybrid Cross, F2 Bb x Bb F1 Generation, Dihybrid Cross SsBb x SsBb Dihybrid Cross : F1, F2 Dihybrid Cross: Peas (P – generation) RRYY x rryy R = Round, dominant; r = wrinkled , recessive Y = yellow, dominant; y = green recessive