If a pattern of inheritance for a trait is complete dominance, an organism heterozygous for that trait would normally express the dominant phenotype.

Here's why:

* Complete dominance means one allele (the dominant allele) completely masks the expression of the other allele (the recessive allele) when they are present together.

* Heterozygous means an organism has two different alleles for a particular trait.

Therefore, in a heterozygous individual, the dominant allele will determine the phenotype, while the recessive allele will have no visible effect.

Example:

Let's say brown eyes (B) are dominant to blue eyes (b). A heterozygous individual with the genotype Bb will have brown eyes because the dominant brown eye allele (B) masks the recessive blue eye allele (b).