The type of inheritance that involves the partial expression of two different alleles is called incomplete dominance.

Here's why:

* Incomplete dominance occurs when neither allele completely masks the other. Instead, the heterozygous phenotype is a blend or intermediate between the two homozygous phenotypes.

* Example: In snapdragons, a red flower (RR) crossed with a white flower (WW) will produce offspring with pink flowers (RW). This is because the red and white alleles are incompletely dominant, resulting in a mixed color expression.

Let me know if you'd like more examples or explanations!