A fruit fly with the genotype st+/st;bw+/bw has eyes that are what color? (+ is wild type and st =bright red and bw=brown) Solution Fruit fly with the genotype +/st - Shows Red colour phenotype, A wild type phenotype. Fruit fly with the genotype +/bw also shows Red colour phenotype. A wild type phenotype. Question is not bit clear, post the question in comments, I will respond..