Codominance

What is codominance?

• Codominance occurs when both alleles are expressed equally and contribute to the phenotype, with their either being a blend of the two characteristics or both characteristics being seen together

What is the difference between dominant-recessive gene relationships and codominance

• Unlike typical dominant-recessive gene relationships, both alleles in codominance share equal dominance which means that both alleles are visible in the organism’s observable characteristics which leads to a phenotype that is a mixture of both alleles rather than just one.

How do you show codominance

• An uppercase letter is used to signify the gene (e.g. C for the colour of a particular trait in an organism)

• Superscript uppercase letters indicate the alleles (e.g. C^r and C^w for red or white colouration)

  • Avoid lowercase letters to prevent the implication of recessiveness

look at example on notes

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