In studies of recombination between mutants 1 and 2 from Problem 21, the results shown in the following table were obtained. Strain Dilution Plaques Phenotypes E. coli B 10⁻⁷ 4 r E. coli K12 10⁻² 8 + Mutant 7 (Problem 21) failed to complement any of the other mutants (1–6). Define the nature of mutant 7.