Here's a breakdown:

* Incomplete dominance: This occurs when neither allele for a trait is completely dominant over the other. Instead, the heterozygous phenotype is a blend or intermediate between the two homozygous phenotypes.

Example: In snapdragons, the allele for red flowers (R) is incompletely dominant over the allele for white flowers (r).

* RR: Red flowers

* rr: White flowers

* Rr: Pink flowers (a blend of red and white)

Key takeaway: Incomplete dominance results in a "blending" of traits, rather than one allele completely masking the other.