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How much does it currently cost to sequence a human genome?
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- 9.12 Describe the steps you would take to obtain a null allele in your favorite yeast gene (YFG) using homologous recombination if you have available a yeast strain that is sensitive to the antibiotic kanamycin, pBluescript II plasmids (see Chapter 8, p. 176) with the DNA inserts diagrammed in Figure 9.B, and are able to transform yeast with a targeting vector, once you construct it. In Figure 9.B, EcoRI, HaeII, HindIII, and PstI are restriction enzymes (see Chapter 8, p. 174) that cleave these DNAs at the sites shown, and the distances between the sites aregiven in kb. As part of your answer, diagram the targeting vector you would construct and the structure of the chromosomal region once YFG is knocked out using this targeting vector. Also, describe how you would use PCR to confirm that you had obtained a null allele at the gene, and indicate on your diagrams the regions you would use for designing PCR primers. Remember that the absence of a PCR product does not provide strong evidence for a specific DNA arrangement, as a PCR could fail for any number of reasons.