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Q 2716791679.     A mutant strain ofT4- Bacteriophage, R-II, fails
to lyse the £-Coli but when two strains R-IIX
and R-IIY are mixed then they lyse the E. Coli.
What may be the possible reason?
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)