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) A cistron is defined by no complementation in the _____________configuration.

Select one:

(a) cis

(b) trans

How many genes are mutated in this experiment? (use anumber not a word in the space) _____________________

Which of the following strains below are defective in the same gene as strain 7? Answer yes if the strain is defective or no if it is not.

1 2 3 4 5 6 7 8 1 - - + + + + + + 2 - + + + + + + 3 - + + - + - 4 - + + - + 5 - + + + 6 - + - 7 - + 8 -

Explanation / Answer

A cistron is defined by no complementation in the trans configuration

How many genes are mutated in this experiment?

ans 13

Strain Defective 1 no 2 no 3 yes 4 no 5 no 6 yes 7 N/A 8 yes

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