11. Eight mutant bacteriophage strains cannot lyse a certain type of bacteria th

Question

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.

Explanation / Answer

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.

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