Blood type is controlled by two equally dominant genes. What type of example is this?

recessive dominance
incomplete dominance
sex-linked genes
codominance

The type of example is Codominance.

Explanation:

The term codominance represents the relation between two alleles at a point when animals heterozygous for the two alleles present both of the phenotypes recognized in animals homozygous for one allele or the other.Codominance happens when two versions, or “alleles,” of the identical gene are present in a living thing, and both are revealed. Instead of one trait being prevailing over the other, both traits develop.It also occurs in some less noticeable traits, such as blood type. It is easy to spot codominance in plants and animals that have more exceeding than one pigment color. Spattered cows and flowers with corollas of two different colors are examples of codominance.