In h phage, a mutation that inactivates which of the following genes should leave the mutated phage strain capable of establishing lysogeny?
A) cro
B) N
C) int
D) cI
E) cII

Question

Quizplus · Accepted Answer

The cro gene in lambda phage is involved in the lytic cycle. A mutation inactivating the cro gene would not prevent the phage from establishing lysogeny, as the cI gene, which promotes lysogeny by repressing lytic genes, would be unaffected.

In H Phage, a Mutation That Inactivates Which of the Following