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  4. 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?

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Q. 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?

BHUBHU 2010

Solution:

The enzymes required for lysing E. coli could not be synthesised by the mutant strain. Two different strains had cistrons for synthesizing two different enzymes which acted together.