That's correct! When two dominant alleles are present for a trait, both are expressed at the same time. This is known as codominance.

Here's an example:

* Blood type: The ABO blood group system is a classic example of codominance. Individuals with the A allele (IA) and the B allele (IB) will express both A and B antigens on their red blood cells, resulting in blood type AB.

Here are some important points to remember about codominance:

* Neither allele is dominant over the other. Both alleles are equally expressed.

* The phenotype is a blend of both alleles. This means the offspring will have a unique phenotype that is different from either parent.

* Not all dominant alleles exhibit codominance. Some dominant alleles completely mask the expression of the recessive allele.

Let me know if you'd like more examples of codominance!