What is true about partial dominance?

Partial dominance describes a genetic scenario where one allele does not completely mask the expression of another allele. Instead, the phenotype produced is a blend of both traits, which results in an intermediate form rather than a complete dominance or recessiveness. This means that the dominant allele can influence the phenotype, but it does so in a way that allows for the visibility of the second allele's effect as well, leading to a phenotype that reflects both traits. This blending of traits is a key characteristic that distinguishes partial dominance from complete dominance, where one allele would entirely suppress the other’s influence on the phenotype.

The understanding of partial dominance also excludes scenarios where one allele completely masks another or where multiple alleles interact in a more complex manner than simple dominance. Therefore, the correct interpretation of partial dominance is that it embodies the idea that one allele can only partially affect the expression of another, which leads to the observed intermediate phenotypes.