Question: E. coli cells were infected with two strains of T2 phage, one wild type for two plaque traits and…

E. coli cells were infected with two strains of T2 phage, one
wild type for two plaque traits and the other doubly-mutant. The
lysate from this mixed infection experiment was plated out, with
the following results: 186 + + 127 a + 139 + b 198 a b What is the
map distance between locus a and locus b?