What is it called when traits from the parents blend together in the offspring?

Incomplete dominance. Incomplete dominance is an inheritance pattern in which an individual expresses features that are not identical to any of the patent alleles. The blending of alleles results in the formation of a third phenotype that doesn’t look like any of the parents. Offsprings with incomplete dominance pattern of inheritance express trait of the third phenotype.

Examples of features include changes in skin color, height, and eye color. Incomplete dominance is not the same as codominance. Co dominance is an inheritance pattern where both parent alleles are expressed in the offspring. Example: A white flower and red flower producing an offspring with white and red patches. Complete dominance, on the other hand, occurs when a parent allele is completely expressed in an offspring.