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