In this chapter, we have focused on genetic systems present in bacteria and on the viruses that use bacteria as hosts (bacteriophages). In particular, we discussed mechanisms by which bacteria and their phages undergo genetic recombination, which allows geneticists to map bacterial and bacteriophage chromosomes. In the process, we found many opportunities to consider how this information was acquired. From the explanations given in the chapter, what answers would you propose to the following questions? How do we know that in bacteriophage T4 the rII locus is subdivided into two regions, or cistrons?

Video transcript

Hello everyone and welcome to today's video today we need to identify the inaccurate statement concerning the bacteria of age complementation test and in case you forgot I want to help you recall what this bacteriophage complementation test is going to be testing for. We're going to be able to determine if certain bacteriophage mutations are located in the same or in different systems. Well if they are located in the same systems that we're going to have a negative complementation test. However they're located in different systems. We're going to have positive complementation test. Now going over answer choices we have answer choice eight complementation occurs when each mutation is in a separate system here we have a positive complementation test when they're in different systems. So this is a correct statement. Since we're looking for the incorrect one we're going to cancel this out then we have big complementation does not occur when the mutations are in the same system. This is actually correct as well. We get a negative complementation test so we're going to cancel this out as well. Let me have the complementation purse of the R. L. L. Medium strings are able to lies decades of bacteria. Remember that these are L. L. Gene is going to allow these mutants to lies the bacteria if they are complemented. That means that the genes are still being translated because of this. They're going to be able in fact to lie the bacteria so we're going to cancel this out. Then finally we have seen their wild type phenotype appears in the absence of complementation. This is going to be incorrect because this wall type phenotype is only going to appear in the presence of complementation. Because of this, this is going to be or inaccurate statement, and we're going to highlight it as a final answer to our question. I really hope this video helped you, and I hope to see you on the next one.