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

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Predicting traits The Punnett Square is a valuable tool for visualizing the probability of the inheritance of certain traits
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Punnett Squares
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Page 1: 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.

Punnett Squares

Page 2: 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.

TraitsP - Parental Generation• Genotype: TT or tt• Gametes: T or tF1 – First Filial Generation• Genotype: Tt• Gametes: T or tF2 – Second Filial Generation• ** too complicated need to set up a Punnett

Square

Page 3: 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.

Predicting traits

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

Page 4: 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.

Predicting traits

• Genotypes:• Genotypic ratio:• Phenotypes:

Phenotypic ratio: • % tall? • % short? %

Page 5: 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.

Predicting traits

• Genotypes: TT, Tt, tt• Genotypic ratio:• Phenotypes:

Phenotypic ratio:• % tall? • % short?

Page 6: 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.

Predicting traits

• Genotypes: TT, Tt, tt• Genotypic ratio: 1:2:1• Phenotypes:

Phenotypic ratio: • % tall? • % short?

Page 7: 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.

Predicting traits

• Genotypes: TT, Tt, tt• Genotypic ratio: 1:2:1• Phenotypes: tall &

short• Phenotypic ratio: • % tall? • % short?

Page 8: 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.

Predicting traits

• Genotypes: TT, Tt, tt• Genotypic ratio: 1:2:1• Phenotypes: tall &

short• Phenotypic ratio: 3:1• % tall? • % short?

Page 9: 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.

Predicting traits

• Genotypes: TT, Tt, tt• Genotypic ratio: 1:2:1• Phenotypes: tall &

short• Phenotypic ratio: 3:1• % tall? 75%• % short?

Page 10: 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.

Predicting traits

• Genotypes: TT, Tt, tt• Genotypic ratio: 1:2:1• Phenotypes: tall &

short• Phenotypic ratio: 3:1• % tall? 75%• % short? 25%

Page 11: 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.

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?

Page 12: 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.

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 Rr

RR rr

Page 13: 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.

Problem 1

• Genotypic ratio:• Phenotypic ratio:• % of red petals:

Rr Rr

RR rr

Page 14: 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.

Problem 1

• Genotypic ratio: 2:2• Phenotypic ratio:• % of red petals:

Rr Rr

RR rr

Page 15: 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.

Problem 1

• Genotypic ratio: 2:2• Phenotypic ratio: 2:2• % of red petals:

Rr Rr

RR rr

Page 16: 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.

Problem 1

• Genotypic ratio: 2:2• Phenotypic ratio: 2:2• % of red petals: 50%

Rr Rr

RR rr

Page 17: 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.

Problem 2

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

Page 18: 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.

Problem 2

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

Tt Tt

Page 19: 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.

Problem 2

• Genotypic ratio:• Phenotypic ratio: • % of being tall: TT TT

Tt Tt

Page 20: 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.

Problem 2

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

Tt Tt

Page 21: 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.

Problem 2

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

Tt Tt

Page 22: 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.

Problem 2

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

Tt Tt


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