Context: In a group of guppies, some individuals have a spotted tail and others have an unspotted tail. In this group, the gene for the tail spots trait has two alleles. The allele for a spotted tail (I) is dominant over the allele for an unspotted tail (i).
Squirt is a guppy from this group. Squirt has the heterozygous genotype Ii for the tail spots gene.
Based on this information, what is Squirt's phenotype for the tail spots trait?
A. a spotted tail
B. an unspotted tail
Select the correct answer from the given choices and respond with the letter of the chosen option.

A