Mendelian Genetics
Gregor Mendel,
Augustinian Monk
(Augustinians = A Catholic
religious order)
Mendelian Genetics
Vocab:
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1. Gregor Mendel
2. Dominant
3. Recessive
4. Allele
5. Phenotype
6. Genotype
7. Heterozygous
8. Homozygous
Vocab
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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
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Mendelian Traits in Pea
Plants
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Monohybrid Cross : Peas
TT x tt
 TT ( Homozygous Dominant) crossed
with tt ( Homozygous Recessive)
Monohybrid Cross : Peas
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P Generation : TT x tt =
F1 generation: Phenotype =
100 % Tall pea plants
Genotype =
100 % Heterozygous , Tt
Monohybrid Cross : Peas
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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
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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