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Principles of Inheritance and Variation
Co-dominance
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Concepts tested
- Both alleles expressed in heterozygote
All Questions
2001 AIPMT 1 question
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When dominant and recessive alleles express themselves together it is called : -In co-dominance, both alleles of a gene express themselves fully in the heterozygote; neither masks the other.
Example: in the ABO blood group, $I^A$ and $I^B$ are both expressed in $I^AI^B$ (blood group AB); in cattle, red and white give roan.
In dominance only the dominant allele is expressed, and in incomplete dominance the heterozygote is intermediate.
So when both alleles express themselves together, it is called co-dominance.