Punnett Squares Essential Question What determines which characteristics

Essential Question • What determines which characteristics we inherit from our biological parents?

Traits P - Parental Generation • Genotype: TT or tt • Gametes: T or

Predicting traits • The Punnett Square is a valuable tool for visualizing the probability

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

Predicting traits • Genotypes: TT, Tt, tt • Genotypic ratio: • Phenotypes: Phenotypic ratio:

Predicting traits • Genotypes: TT, Tt, tt • Genotypic ratio: 1: 2: 1 •

Problem 1 • #1 Two parents(P), one heterozygous red petal is crossed with a

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

Problem 1 • Genotypic ratio: 2: 2 • Phenotypic ratio: • % of red

Problem 1 • Genotypic ratio: 2: 2 • Phenotypic ratio: 2: 2 • %

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

Problem 2 • Genotypic ratio: 2: 2 • Phenotypic ratio: • % of being

Problem 2 • Genotypic ratio: 2: 2 • Phenotypic ratio: 4 • % of

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Punnett Squares

Essential Question • What determines which characteristics we inherit from our biological parents?

Traits P - Parental Generation • Genotype: TT or tt • Gametes: T or t F 1 – First Filial Generation • Genotype: Tt • Gametes: T or t F 2 – 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 F 1 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 F 1 generation? Rr Rr RR rr

Problem 1 • Genotypic ratio: • Phenotypic ratio: • % of red petals: Rr Rr RR rr

Problem 1 • Genotypic ratio: 2: 2 • Phenotypic ratio: • % of red petals: Rr Rr RR rr

Problem 1 • Genotypic ratio: 2: 2 • Phenotypic ratio: 2: 2 • % of red petals: Rr Rr RR rr

Problem 1 • Genotypic ratio: 2: 2 • Phenotypic ratio: 2: 2 • % of red petals: 50% Rr Rr RR rr

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

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

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

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

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

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