A mutant strain of T4 – Bacteriophage, R...

A mutant strain of `T_4` – Bacteriophage, R-II, fails to lyse the E-Coli but when two strains `R-II^X` and `R-II^Y` are mixed then they lyse the E.Coli. What may be the possible reason : -

Bacteriophoage transforms in wild

It is not mutated

Both strains have similar cistrons

Both strains have different cistrons

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