Abstract
Textbooks are using a variety of symbols for expressing codominance or lack of dominance among alleles. One of the most common and yet inconsistent ways is to use the same upper case/lower case system as in a regular dominant/recessive pair, e.g., RR = Red, Rr = Pink, and rr = white. Students are told that this is an example of codominance in which the heterozygous genotype results in a phenotype that is a blend of the two codominant traits. This is inconsistent and confusing. In this note I am proposing a more consistent system.
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