Questions 23 & 24 refer to the following: Shown below are the complementation te

Question

Questions 23 & 24 refer to the following: Shown below are the complementation test results involving A independently isolated lethal mutants in the strains, eachwith a assayed by simultaneously infecting bacteria 2 different mutation, neither of which could alone lyse the cells. the table below, a indicates the strains complimented each other and therefore lysed open the bacteria. A "0" indicates no complementation, and therefore no cell lysis occurred. Results Test Pair 0 1, 2 1, 3 1, 4 2, 3 2, 4 3, 4

Explanation / Answer

23) Complementation in genetics is the relationship between two different strains of an organism which both have homozygous recessive mutations that produce the same phenotype but which do not reside on the same gene. When we don’t know whether two mutations are on the same gene or on different genes we perform a complementation test. Since the mutations are recessive, the offsprings will recover the function if the genes are present together. Here when 2 and 4 are test paired, the function is recovered. So, the answer for this question is option (e) 2 & 4.

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