That statement is not entirely accurate. While it's true that dominant alleles can mask the expression of recessive alleles, this doesn't always result in a blending of traits.

Here's why:

* Dominant and Recessive Alleles: When one allele (dominant) masks the expression of another allele (recessive), the offspring will display the trait associated with the dominant allele. For example, brown eyes are dominant over blue eyes. If one parent has brown eyes (BB or Bb) and the other has blue eyes (bb), the offspring will likely have brown eyes.

* Blending of Traits: Blending of traits can occur in situations where incomplete dominance is present. This means neither allele is completely dominant, and the offspring's phenotype is a mix of both parental traits. For example, if a red flower (RR) is crossed with a white flower (WW), the offspring will be pink (RW).

* Codominance: Another scenario where the offspring doesn't just display one dominant trait is codominance. In this case, both alleles are expressed equally in the phenotype. For example, a person with blood type AB expresses both the A and B alleles on their red blood cells.

In summary:

* Dominant/recessive inheritance: One trait is expressed, masking the other.

* Incomplete dominance: A mix of both parental traits is observed.

* Codominance: Both parental traits are expressed equally.

Therefore, offspring showing a blend of parental traits is not exclusively due to one allele being dominant over another. It can also be due to incomplete dominance.