Punnett Squares. Traits P - Parental Generation Genotype: TT or tt Gametes: T or t F1 – First Filial Generation Genotype: Tt Gametes: T or t F2 – Second.

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Presentation transcript:

Punnett Squares

Traits P - Parental Generation Genotype: TT or tt Gametes: T or t F1 – First Filial Generation Genotype: Tt Gametes: T or t F2 – Second Filial Generation ** too complicated need to set up a Punnett Square

Predicting traits The Punnett Square is a valuable tool for visualizing the probability of the inheritance of certain traits

Predicting traits Genotypes: Genotypic ratio: Phenotypes: Phenotypic ratio: % tall? % short? %

Predicting traits Genotypes: TT, Tt, tt Genotypic ratio: Phenotypes: Phenotypic ratio: % tall? % short?

Predicting traits Genotypes: TT, Tt, tt Genotypic ratio: 1:2:1 Phenotypes: Phenotypic ratio: % tall? % short?

Predicting traits Genotypes: TT, Tt, tt Genotypic ratio: 1:2:1 Phenotypes: tall & short Phenotypic ratio: % tall? % short?

Predicting traits Genotypes: TT, Tt, tt Genotypic ratio: 1:2:1 Phenotypes: tall & short Phenotypic ratio: 3:1 % tall? % short?

Predicting traits Genotypes: TT, Tt, tt Genotypic ratio: 1:2:1 Phenotypes: tall & short Phenotypic ratio: 3:1 % tall? 75% % short?

Predicting traits Genotypes: TT, Tt, tt Genotypic ratio: 1:2:1 Phenotypes: tall & short Phenotypic ratio: 3:1 % tall? 75% % short? 25%

Problem 1 #1 Two parents(P), one heterozygous red petal is crossed with a white petal flower. Red is dominant to white. What is the phenotypic ratio of the F1 generation?

Problem 1 #1 Two parents(P), one heterozygous red petal is crossed with a white petal flower. Red is dominant to white. What is the phenotypic ratio of the F1 generation? Rr RRrr

Problem 1 Genotypic ratio: Phenotypic ratio: % of red petals: Rr RRrr

Problem 1 Genotypic ratio: 2:2 Phenotypic ratio: % of red petals: Rr RRrr

Problem 1 Genotypic ratio: 2:2 Phenotypic ratio: 2:2 % of red petals: Rr RRrr

Problem 1 Genotypic ratio: 2:2 Phenotypic ratio: 2:2 % of red petals: 50% Rr RRrr

Problem 2 #2 Cross a homozygous tall with a heterozygous tall.

Problem 2 #2 Cross a homozygous tall with a heterozygous tall. TT Tt

Problem 2 Genotypic ratio: Phenotypic ratio: % of being tall: TT Tt

Problem 2 Genotypic ratio: 2:2 Phenotypic ratio: % of being tall: TT Tt

Problem 2 Genotypic ratio: 2:2 Phenotypic ratio: 4 % of being tall: TT Tt

Problem 2 Genotypic ratio: 2:2 Phenotypic ratio: 4 % of being tall: 100% TT Tt