Blank ABO blood type Punnett square worksheet (codominance)

An example figure from the Punnett Square generator.

A blank Punnett square under a question about blood type, with Mother Iᴬi across the top and Father Iᴮi down the side, gametes Iᴬ and i and Iᴮ and i, four empty cells, and blank lines for the genotype and phenotype ratios — A Punnett square worksheet on ABO blood type, with a question above it: a mother with type A blood and a father with type B blood each carry the allele for type O. The parents are labeled Mother Iᴬi and Father Iᴮi, with gametes Iᴬ and i across the top and Iᴮ and i down the side, and the four cells are left empty for students. Blank lines follow for the genotype and phenotype ratios.

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Answer key

Genotype ratio: 1 IᴬIᴮ : 1 Iᴬi : 1 Iᴮi : 1 ii
Phenotype ratio: 1 type A : 1 type AB : 1 type B : 1 type O

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