Context: This passage describes the iridescent scales trait in bettas:

In a group of bettas, some individuals have mostly iridescent scales and others have mostly plain scales. In this group, the gene for the iridescent scales trait has two alleles. The allele I is for mostly iridescent scales, and the allele i is for mostly plain scales.
Dory, a betta from this group, has mostly iridescent scales. Dory has one allele for mostly iridescent scales and one allele for mostly plain scales.
Based on this information, what is Dory's phenotype for the iridescent scales trait?
A. mostly iridescent scales
B. Ii
Choose the right answer from the options and respond with its letter.

A