Concept explainers
Several types of mutation are identified and described in the chapter. These include
a. A mutation that changes several amino acids in a protein that is shorter than the wild
b. A mutation that produces about
c. A mutation that produces a mutant protein that differs from the wild
d. A mutation that produces a protein that is shorter than the wild
e. A null mutation that does not produce any functional protein product.
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Chapter 11 Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
- What is a A hypomorphic mutation?arrow_forwardTwo possible point mutations are the substitution of lysine for leucine or the substitution of serine for threonine. Which is likely to be more serious and why?arrow_forwardWhat type of mutation is shown in the diagram? Why do you think this type of mutation is referred to by this term?arrow_forward
- There are five substitution mutations in the dark-colored mutant Mc1r gene. Compare the DNA sequence of the light-colored wild-type Mc1r gene with the DNA sequence of the dark-colored mutant Mc1r gene. Indicate the locations of the five mutations by changing the font color to YELLOW for the five single DNA nucleotides that are mutated in the mutant Mc1r gene table. Using the information in the introduction, determine whether each of these mutations is a silent, missense, or nonsense mutation. Using the mutant Mc1r gene data, fill in the columns (including DNA, mRNA, and amino acid) in gene table 2 that contain a silent mutation with BLUE. Likewise, fill in the columns that contain a missense mutation with RED. Shade any columns that contain nonsense mutations with GREEN. Then Of the five mutations you identified in the mutant Mc1r gene, how many are: substitutions insertions deletions (Enter a number on each line.) 2. Of the five mutations…arrow_forwardTwo types of mutations discussed in this chapter are (1) nucleotide changes and (2) unstable genome regions that undergo dynamic changes. Describe each type of mutation.arrow_forwardIf the coding region of a gene (the exons) contains 2,100 base pairs of DNA, would a missense mutation cause a protein to be shorter, longer, or the same length as the normal 700 amino acid proteins? What would be the effect of a nonsense mutation? A sense mutation?arrow_forward
- Although it is well known that X-rays cause mutations, they are routinely used to diagnose medical problems, including potential tumors, broken bones, and dental cavities. Why is this done? What precautions need to be taken?arrow_forwardIf an extra nucleotide is inserted in the first exon of the beta globin gene, what effect will it have on the amino acid sequence of the globin polypeptides? Will the globin most likely be fully functional, partly functional, or nonfunctional? Why?arrow_forwardName three different types of loss of function mutations and in each case explain how the mutation exerts a loss of function effect on a genearrow_forward
- A mutant strain of bacteria is isolated in which the amino acid glutamine is often erroneously substituted for glutamic acid during protein synthesis. What kind of mutation might be underlying this defect? How could you test this hypothesis?arrow_forwardSilent mutations that occur in DNA are quite common in living cells and usually involve no effects onphenotype. In not more than 2 pages (using 1.5 line space of Arial or Times New Roman fonts) provideanswers for the following questions?1) Define the silent mutation in DNA? (2.5 marks)2) What is the codon usage bias? (2.5 marks)3) Provide one example of a clinical implication of a “silent mutation” that proven to have an effect onthe phenotype and provide a brief description of its molecular characteristics? (10.0 marks)arrow_forwardBased on the following wild type sequence, indicate if each of the mutations should be classified as : insertion, deletion, missense, nonsense, silent (Use the provided Genetic Code table). Wild Type: GUC GCC GAC GAG AGG Mutant 1: GUC GCC AGA CGA GAG G Mutant 2: GUC GCC ACG AGA GG Mutant 3: GUC GCC AAC GAG AGG Mutant 4: GUA GCC GAC GAG AGG Mutant 5: GUC GCC GAC UAG AGGarrow_forward
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