Genetic Analysis: An Integrated Approach (2nd Edition)
2nd Edition
ISBN: 9780321948908
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Textbook Question
Chapter 17, Problem 28P
The highlighted sequence shown below is the one originally used to produce the B chain of human insulin in E. coli. The sequence of the human gene encoding the B chain of insulin was later determined from a cDNA isolated from a human pancreatic cDNA library and is also shown below, without highlighting. Explain the differences between the two sequences.
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Human wildtype and mutant alleles are identical in sequence except for a single base-pair substitution that changes one nucleotide towards the end of intron 2. The wildtype and mutant sequences of the affected portion of the mRNA are listed in the following table.
Explain how a single base substitution could alter the reading frame, which could result in a physiological disorder?
You want to clone the Human Gene A into a plasmid for producing the Protein A in bacteria. GeneA encodes an mRNA of 100 nucleotides long, but the entire gene spans more than 4000 nucleotides. There are three exons and two introns. If we were to clone this gene directly from the nuclear DNA, bacteria would not be able to express the insulin protein. Explain why this is true.
An example sequence corresponds to human sickle cell beta-globin mRNA and that this disease results from a point mutation in the β globin gene. In the following section, you will compare sickle cell and normal β globin sequences to reveal the nature of the sickle cell mutation at the protein level. To do this you need to find at
least one sequence representing the normal beta globin gene. Open a new window and visit the NCBI home page(http://www.ncbi.nlm.nih.gov) and select “Nucleotide” from the drop menu associated with the top search box. Then enter the search term: HBB . Note that lots of irrelevant results are returned so let's apply some “Filters” (available by clicking in the left-hand sidebar) to focus on RefSeq entries for Homo sapiens. Remember that we are after mRNA so we can compare to the mRNA sequence from part 1 above.
QUESTION #1:
What is the ACCESSION number of the “Homo sapiens hemoglobin, beta (HBB), mRNA” entry?
NOTE: Boolean operators (NOT, AND, OR) as…
Chapter 17 Solutions
Genetic Analysis: An Integrated Approach (2nd Edition)
Ch. 17 - 15.1 What purpose do the bla and lacZ genes serve...Ch. 17 - The human genome is 3109 bp in length. How many...Ch. 17 - 15.3 Ligase catalyzes a reaction between the...Ch. 17 - You have constructed four different libraries: a...Ch. 17 - Using the genomic libraries in Problem 4, you wish...Ch. 17 - The human genome is 3109bp. You wish to design a...Ch. 17 - 15.7 Using animal models of human diseases can...Ch. 17 - 15.8 Compare methods for constructing homologous...Ch. 17 - 15.9 Chimeric genefusion products can be used for...Ch. 17 - 15.10 Why are diseases of the blood simpler...
Ch. 17 - Injection of double-stranded RNA can lead to gene...Ch. 17 - Compare and contrast methods for making transgenic...Ch. 17 - 15.13 It is often desirable to insert cDNAs into a...Ch. 17 - 15.14 A major advance in the s was the development...Ch. 17 - 15.15 The bacteriophage lambda genome can exist in...Ch. 17 - 15.16 The restriction enzymes Xho and Sal cut...Ch. 17 - 15.17 The bacteriophage has a single-stranded DNA...Ch. 17 - 15.20 You have identified a cDNA clone that...Ch. 17 - You have isolated a genomic clone with an EcoR I...Ch. 17 - 15.18 To further analyze the CRABS CLAW gene (see...Ch. 17 - 15.21 You have isolated another cDNA clone of the...Ch. 17 - 15.22 You have identified five genes in S....Ch. 17 - You have generated three transgenic lines of maize...Ch. 17 - 15.24 Bacterial Pseudomonas species often possess...Ch. 17 - 15.25 Two complaints about some transgenic plants...Ch. 17 - 15.26 In Drosophila, lossoffunction Ultrabithorax...Ch. 17 - Prob. 27PCh. 17 - The highlighted sequence shown below is the one...Ch. 17 - The RAS gene encodes a signaling protein that...Ch. 17 - Vitamin E is the name for a set of chemically...Ch. 17 - 15.31 You have cloned a gene for an enzyme that...
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- After Drosophila DNA has been treated with a restriction enzyme, the fragments are inserted into plasmids and selected as clones in E. coli. With the use of this “shotgun” technique, every DNA sequence of Drosophila in a library can be recovered.a. How would you identify a clone that contains DNA encoding the protein actin, whose amino acid sequence is known?b. How would you identify a clone encoding a specific tRNA?arrow_forwardA microbiologist discovers a new type II restriction endonuclease. When DNA is digested by this enzyme, fragments that average 1,048,500 bp in length are produced. What is the most likely number of base pairs in the recognition sequence of this enzyme?arrow_forwardProvide the consensus sequence for the first three actual sequences shown in Figurearrow_forward
- Consider this sequence below: GAG TAC ACG AGT GGA Which of the following options is an example of a non-synonymous point mutation? (remember to translate to mRNA!) A. GAG TAC AAT CGA GTG GA B. GAG TAC ACG GGT GGA C. GAG TAC A–G AGT GGA D. GAG TAC ACG AGA GGAarrow_forwardScientists have observed that individuals with LOW birthweight are MORE likely to become obese as teenagers. To study this observation in more depth, a scientist compared the methylation of the promoter region of the leptin gene in low birthweight (LBW) and normal birthweight (NBW) individuals by treating isolated DNA from these individuals with bisulfite and comparing the results to untreated DNA. The results are shown below. What conclusion can you draw? Untreated: ATTCGATTCGCGAA Treated NBW: ATTCGATTCGCGAA Treated LBW: ATTTGATTCGTGAA Scientists have observed that individuals with LOW birthweight are MORE likely to become obese as teenagers. To study this observation in more depth, a scientist compared the methylation of the promoter region of the leptin gene in low birthweight (LBW) and normal birthweight (NBW) individuals by treating isolated DNA from these individuals with bisulfite and comparing the results to untreated DNA. The results are shown below. What…arrow_forwardIn producing genetically engineered human insulin in bacteria, why is it important to use the samerestriction enzyme to cut both the human DNA and the bacterial plasmid?arrow_forward
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