In a group of fruit flies, some individuals have red eyes and others have brown eyes. In this group, the gene for the eye color trait has two alleles. The allele E is for red eyes, and the allele e is for brown eyes.

A certain fruit fly is from this group. This fruit fly's phenotype for the eye color trait is red eyes. This fly's genotype for the eye color gene is Ee.
Based on this information, complete the following statement

The fruit fly's genotype for the eye color gene is heterozygous.