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Chapter 15 Solutions
Study Guide And Solutions Manual For Genetic Analysis: An Integrated Approach
- The figure below shows the recognition sequences and cleavage positions of three restriction enzymes.You plan to ligate DNA from two different sources. The target DNA is digested with BamHI,and the insert DNA is digested with BglII, and the resulting fragments mixed and incubatedwith DNA ligase. a) Write out the sequence (in double-stranded format) of the longest insert fragment that will result after BglII digestion, ensure the nature of the overhangs is clear.b) Write out the sequence (in double-stranded format) of the ligation product, with the insert fragment joined into the BamHI site of the target DNA. Use black for target sequences, and blue for insert sequences. c) Assume the ligation reaction was successful and you have generated a recombinant DNAmolecule. Which of the three enzymes listed above can be used to excise the insert DNAfrom the target? Motivate your answer.arrow_forwardRefer to the figure. What method would you use if you wanted to determine the sequence of the cDNA of the peak protein? Briefly explain the sequencing methodarrow_forwardGenomic DNA from a family where sickle-cell disease is known to be hereditary, is digested with the restriction enzyme MstII and run in a Southern Blot. The blot is hybridised with two different 0.6 kb probes, both probes (indicated in red in the diagram below) are specific for the β-globin gene (indicated as grey arrow on the diagram below). The normal wild-type βA allele contains an MstII restriction site indicated with the asterisk (*) in the diagram below; in the mutated sickle-cell βS allele this restriction site has been lost. What size bands would you expect to see on the Southern blots using probe 1 and probe 2 for an individual with sickle cell disease (have 2 βS alleles)? Probe 1 Probe 2 (a) 0.6kb 0.6kb and 1.2kb (b) 0.6kb and 1.8kb 0.6kb, 1.2kb and 1.8kb (c) 1.2kb 0.6kb (d) 1.8kb 1.8kb a. (a) b. (b) c. (c) d. (d)arrow_forward
- When the restriction endonuclease EcoRI is used to digest a 10 kb DNA fragment, it produces 4 kb and 6 kb-sized fragments. Digesting the 10 kb fragment with BamHI yields three fragments, each ranging in size from one to three and a half kilobytes. Four pieces of 0.5, 1, 3 and 5.5 kb are formed after using both enzymes. Create a restriction map for this 10 kb piece of DNA using the information you have collected. Make a note of where the two enzymes cut, as well as the distances between the enzymes.arrow_forwardEarly gene-cloning experiments involved insertion at one restriction site in the vector; for example, the insert would have an EcoRI site at each end, and the vector would be opened at an EcoRI site prior to ligation. Under what circumstances would asymmetric cloning be desirable, with the insert having a different restriction site at each endarrow_forwardA linear piece of DNA that is 14 kb long is cut first by EcoRI alone, then by SmaI alone, and finally, by both EcoRI and SmaI together. The following results are obtained: Draw a map of the EcoRI and SmaI restriction sites on this 14-kb piece of DNA, indicating the relative positions of the restriction sites and the distances between them.arrow_forward
- The gene you are asked to clone is 30,000 bps in length. When you are choosing a suitable Restriction Endonuclease, what criteria about the enzyme can you deduce from the gene length?arrow_forwardDescribe the process of cloning a DNA fragment into theBamHI and PstI sites of the vector pUC18. How would youscreen for clones that contain an insert? and explain the process(steps) by drawingarrow_forwardYou are trying to clone a gene, You have successfully isolated it from the genomic DNA of an organism using the Hindill restriction enzyme. You then take a plasmid with a single EcoRI restriction site and cleave it with EcoRI. You combine these two fragments and treat them with DNA ligase. Answer the two questions below. a. Does the cloning reaction succeed as described? If so, what is the product obtained? b. Explain your answer above,arrow_forward
- To estimate the number of cleavage sites in a particular piece of DNA with a known size, you can apply the formula N/4n where N is the number of base pairs in the target DNA and n is the number of bases in the recognition sequence of the restriction enzyme. If the recognition sequence for BamHI is GGATCC and the l phage DNA contains approximately 48,500 bp, how many cleavage sites would you expect?arrow_forwardStarting with a sample of RNA that contains the mRNA for theβ-globin gene, explain how you could create many copies of theβ-globin cDNA using reverse transcriptase PCR.arrow_forwardYou have a recombinant plasmid containing a vector and a segment of foreign DNA, both equal sizes. Draw a picture of this recombinant plasmid labeling foreign and vector regions. Where the foreign DNA meets the vector, there is a cut site for restriction enzyme ABC1. When the recombinant plasmid is cut by ABC1, how many fragments do you expect to be produced? Identify these fragments.arrow_forward
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