In which mode of inheritance do neither parent's traits dominate, resulting in blended traits?

Incomplete dominance describes a mode of inheritance in which the phenotypes of the parents blend to create a new trait in the offspring. This occurs when neither allele is completely dominant over the other, leading to a phenotype that is an intermediate expression of the traits. A classic example of this is seen in the flower color of snapdragons, where red and white flowers can produce pink offspring.

In contrast, codominance refers to a situation where both alleles are fully expressed in the phenotype, resulting in offspring that display traits from both parents distinctly rather than as a blend. Mendelian inheritance typically involves complete dominance relationships where one allele completely masks the effects of another. Polygenic inheritance involves multiple genes contributing to a single trait, often resulting in a continuous range of phenotypes rather than a blended effect.

Thus, the correct answer highlights the unique characteristic of incomplete dominance, where parental traits do not dominate and lead to an intermediate phenotype.