In a group of koi fish, some individuals have red eyes and others have black 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 black eyes.
Gurgle, a koi fish from this group, has red eyes. Gurgle has one allele for red eyes and one allele for black eyes.
Based on this information, what is Gurgle's genotype for the eye color gene?