Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Chapter 15, Problem 21PDQ
In maize, a Ds or Ac transposon can alter the function of genes at or near the site of transposon insertion. It is possible for these elements to transpose away from their original insertion site, causing a reversion of the mutant phenotype. In some cases, however, even more severe
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Imagine a scenario in which prenatal testing of a human female fetus indicates that the baby will have a normal XX karyotype but is heterozygous for a mutation that inactivates the Xist promoter. Allele “Xr” represents the mutated version of the Xist promoter, and “XR” represents the normal version of the Xist promoter.
How will this mutation affect the process of X inactivation?A. "X inactivation will still be random with both mutant and normal X chromosomes being randomly inactivated"
B. "The chromosome with the mutant Xist promoter will always be active"
C. "The chromosome with the mutant Xist promoter will always be inactivated"
D. "The normal X chromosome (no mutation in Xist) will always be active"
E. "The normal X chromosome (no mutation in Xist) will always be inactivated"
What does it mean for a transposable element to be effectively “dead”?
A.
The transposable elements are “dead” because they are only found in non-coding regions and therefore do not interfere with phenotypic expression. B.
The transposable elements are “dead” because they are no longer able to undergo transposition and move to another region of the genome.
C.
The transposable elements are “dead” because they do cause disease despite their presence.
D.
The transposable elements are “dead” because they occur only in somatic cells and therefore are not heritable.
In this module, you have learned about the use of balancer chromosomes (such as TM2 and TM6C in the below crossing scheme) for isolating Drosophila mutants during EMS mutagenesis. Please inspect the following crossing scheme and choose which of the following statements is correct.
A.
TM6C is preferable over TM2 when performing mutagenesis
B.
EMS induces chromosomal inversion
C.
A balancer chromosome helps to isolate on which chromosome the mutant is located
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Chapter 15 Solutions
Concepts of Genetics (12th Edition)
Ch. 15 - If a point mutation occurs within a human egg cell...Ch. 15 - One of the most famous cases of an X-linked...Ch. 15 - The cancer drug melphalan is an alkylating agent...Ch. 15 - Geneticists often use the alkylating agent...Ch. 15 - Six months pregnant, an expectant mother had a...Ch. 15 - Six months pregnant, an expectant mother had a...Ch. 15 - HOW DO WE KNOW? In this chapter, we focused on how...Ch. 15 - CONCEPT QUESTION Review the Chapter Concepts list...Ch. 15 - What is a spontaneous mutation, and why are...Ch. 15 - Prob. 4PDQ
Ch. 15 - Prob. 5PDQCh. 15 - Why is a random mutation more likely to be...Ch. 15 - Most mutations in a diploid organism are...Ch. 15 - What is the difference between a silent mutation...Ch. 15 - Describe a tautomeric shift and how it may lead to...Ch. 15 - Contrast and compare the mutagenic effects of...Ch. 15 - Why are frameshift mutations likely to be more...Ch. 15 - Why are X rays more potent mutagens than UV...Ch. 15 - DNA damage brought on by a variety of natural and...Ch. 15 - Contrast the various types of DNA repair...Ch. 15 - Mammography is an accurate screening technique for...Ch. 15 - A significant number of mutations in the HBB gene...Ch. 15 - Describe how the Ames test screens for potential...Ch. 15 - Prob. 18PDQCh. 15 - Compare DNA transposons and retrotransposons. What...Ch. 15 - Prob. 20PDQCh. 15 - In maize, a Ds or Ac transposon can alter the...Ch. 15 - Prob. 22PDQCh. 15 - In a bacterial culture in which all cells are...Ch. 15 - Presented here are hypothetical findings from...Ch. 15 - Prob. 25ESPCh. 15 - Prob. 26ESPCh. 15 - What evidence indicates that mutations in human...Ch. 15 - Among Betazoids in the world of Star Trek, the...Ch. 15 - Skin cancer carries a lifetime risk nearly equal...Ch. 15 - It has been noted that most transposons in humans...Ch. 15 - Mutations in the IL2RG gene cause approximately 30...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
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- In Neurospora, a mutant strain called stopper (stp) arose spontaneously. Stopper showed erratic “stop and start” growth, compared with the uninterrupted growth of wild-type strains. In crosses, the following results were found:/ stopper × wild type → progeny all stopper/ wild type × stopper → progeny all wild typea. What do these results suggest regarding the location of the stopper mutation in the genome? b. According to your model for part a, what progeny and proportions are predicted in octads from thearrow_forwardMutations in the CFTR gene result in cystic fibrosis in humans, a conditions in which abnormal secretions are present in the lungs, pancreas, and sweat glands. The gene was mapped to a 500-kb region on chromosome 7 containing 3 candidate genes. a)Using your knowledge of the disease symptoms, how would you distinguish between the candidate genes to decide which is most likely to encode the CFTR gene? b)How would you prove that your chosen candidate is the CFTR gene?arrow_forwardIn a particular organism, there are two similar genes called YFG1 and YFG2. YFG1 is expressed in the liver and not in the pancreas, and YFG2 is expressed in the pancreas but not the liver. Neither YFG1 nor YFG2 is expressed in the heart. If you extract DNA from heart cells, do you expect to see the YFG2 gene? Explain why. Do you expect to see the YFG1 protein when you analyze protein extract from liver cells? And from pancreas cells? And from heart cells? Explain why. Is it possible to produce YFG1 and YFG2 proteins via alternative splicing? Explain one possible way (mechanism) to regulate the expression of YFG1 gene.arrow_forward
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