DNA from a Bacillus subtilis strain with genotype trp⁺tyr⁺ was transformed into another Bacillus subtilis strain with genotype trp⁻tyr⁻. The transformants obtained were as follows: trp⁻tyr⁺ = 100, trp⁺tyr⁻ = 125 and trp⁺tyr⁺ = 175. Determine the incorrect conclusion in relation to this experiment.