When traits are COMBINED together and each are expressed.

This is called CODOMINANCE

Explanation:

Codominance is an inheritance pattern that does not conform to Mendel's principle of inheritance i.e. non-mendelian inheritance. Codominance is the process whereby two alleles of a gene are both dominant for their respective traits and hence are simultaneously expressed when in a combined or heterozygous state.

An example is the ABO blood group system in humans. Alleles for A and B are codominant, meaning that, the two traits will be expressed when the two alleles are combined to form AB. Hence, according to this question, when traits are COMBINED together and each are expressed, it is called CODOMINANCE.

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