11 Eight mutant bacteriophage strains cannot lyse a certain

11. Eight mutant bacteriophage strains cannot lyse a certain type of bacteria that can be lysed by wild-type bacteriophages. The mutant strains were allowed to infect the bacteria in a complementation test. A \"+\" indicates that lysis occurred with coinfection. A \"-\" indicates that lysis did not occur.

A cistron is defined by no complementation in the _____ configuration.

(a) cis

(b) trans

How many genes are mutated in this experiment? (Use a number not a word in the space)____________

Which of the following strains below are defective in the same gene as strain 6? Answer yes if the strain is defective or no if it is not.

Solution

1.A cistron is defined by no complementation in the __trans___ configuration.

2. There are 4 genes which are mutated.

From this we can see 1 and 7 in one gene, 2,4,6 in one gene , 3 and 5 in one gene, 8 in one gene. So totally 4 genes.

3. the genes which are defective as 6 are 2 and 4 because they are in same gene.