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Practice problem

Codominance — Overview & Examples

By Diana Kline
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Punnett square of the different crosses of the blood type alleles A, B, and O. A and B are both dominant, and O is recessive. The resulting blood types are AA (A type) AB (AB type) AO (A type) AB (AB type) BB (B type) BO (B type) AO (A type) BO (B type) and OO (O type).

Image source: By Kalaiarasy CC BY 2.0, via Wikimedia Commons

The table above shows different blood type combinations. The A allele and B allele are both dominant alleles, while the O allele is recessive. Using the table above and this information, which blood type combination is codominant?

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Type a concept, like “slope” or “photosynthesis”.

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