Questions 35 and 36 refer to the following. Shown below are the complementation

Question

Questions 35 and 36 refer to the following. Shown below are the complementation test results involving ndependently isolated lethal nutants in a bacteriophage. Complementation was assayed by simultaneously infecting bacteria with two phage strains, each with a different mutation, neither of which could alone lyse the cells, in the table below, a " indicates the strains complemented each other and therefore lysed open the bacteria. AO" indicates no complementation and therefore no cell lysis occurred. The SAME data can also be expressed in the following format. Use the format you understand best to answer the questions. Test pair Results 1,2 2,3 1,5 2,3 2,5 3,4 3, 5 4,5 35. How many genes are there? a) 4 b) 3c) 2 d) one 36. Which of the following strains have mutations are in the same gene? a) 1&2 b) 3&5 c) 1&3 d) 2&5 e) 1&5

Explanation / Answer

Question 35-

We know that one pair will share two genes for the complementation. If a pair fails to complement it means they have missing one gene. Therefore, here we can see that two pairs are fails to complement i.e. 1,4 and 3,5. That means there are two genes responsible for the test.

The correct option is 3rd option ‘c’.

Question 36-

The correct option is 2nd ‘b’ because if they possess the other one too, then complementation will occur. The other one is 1&4.

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