Download Name: Date: Period: ____ Punnett Squares show probability of what

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Name: _________________________ Date: ___________________ Period: ____
Punnett Squares show probability of what traits the offspring can show. It crosses both parent’s
genes to show the possible genotypes (genes/letters) and phenotypes (physical trait/what you
see) of the offspring. A capital letter represents a dominant trait (the trait that shows when at
least one gene is present). A recessive trait only shows with there are TWO recessive genes
present (or lowercase letters). Purebred, or homozygous, means that the organism has two of
the same genes (BB for example). Hybrid, or heterozygous, means that an organism has one of
each gene, a dominant and a recessive (Bb for example).
Example)
A purebred/homozygous yellow pea plant (GG) is being crossed with a
purebred/homozygous green pea plant (gg). Yellow is the dominant color.
G
G
g
Gg
Gg
g
Gg
Gg
Genotype (Ratio) = 0 GG: 4 Gg ; 0 gg
Genotype (Percent) = 0% GG: 100% Gg: 0%gg
Phenotype (Ratio) = 4 Yellow: 0 Green
Phenotype (Percent) = 100% Yellow:0% Green
Let’s practice a few as a class!
1) A hybrid/heterozygous green pea plant (Gg) is crossed with another hybrid/heterozygous
green pea plant (Gg).
Genotype Ratio:
Genotype Percent:
Phenotype Ratio:
Phenotype Percent:
2) A homozygous green plant is crossed with a heterozygous yellow plant.
Genotype Ratio:
Genotype Percent:
Phenotype Ratio:
Phenotype Percent:
Name: _________________________ Date: ___________________ Period: ____
Now try a few with your table partner!
3) A homozygous tall plant (TT) is crossed with a hybrid tall plant (Tt). Tall is the
dominant trait.
Genotype Ratio:
Genotype Percent:
Phenotype Ratio:
Phenotype Percent:
4) A hybrid tall plant is crossed with a purebred short plant.
Genotype Ratio:
Genotype Percent:
Phenotype Ratio:
Phenotype Percent:
Now try two on your own!
5) A homozygous red flower is crossed with a homozygous white flower. Red is the
dominant trait (R).
Genotype Ratio:
Genotype Percent:
Phenotype Ratio:
Phenotype Percent:
6) A purebred red flower is crossed with a homozygous red flower.
Genotype Ratio:
Genotype Percent:
Phenotype Ratio:
Phenotype Percent:
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