Concepts of Genetics (12th Edition)
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 25, Problem 2CS
Summary Introduction

To determine: Whether an individual would disclose WGS results to the parents and reason for the disclosure.

Introduction: WGS (whole genome sequencing) provides sequencing results for entire genome, including noncoding regions. WGS can identify mutations in regulatory regions that lead to disease.

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1. a) If you were at risk of a fatal disease such as Huntington’s disease and only the 95% accurate preliminary genetic test was available, would you take the test? After all, 95% of the time the test would tell you whether you would eventually get Huntington’s disease or whether you did not have to worry about getting this disease. b) The linkage distance between the DNA sequence used in the test and the actual Huntington’ disease locus was 5%. In a large sample of the Venezuelan family, what percentage of people would inherit the DNA sequence but not the Huntington’s allele (i.e. be a false positive test for Huntington’s)? What percentage of that large Venezuelan family would not inherit the DNA sequence but would inherit the Huntington’s allele (i.e., be a false negative test for Huntington’s)?
In your attempts to identify a genetic basis for rheumatoid arthritis in humans, you have DNA samples from three large unrelated families in which individuals with varying severity of rheumatoid arthritis are found. From your analysis of various SNPs, you find that the same four unlinked loci consistently show a correlation with the most severe cases from all three families. Based on your observations, which of the following hypotheses best describes the genetic control of rheumatoid arthritis? ос Rheumatoid arthritis is the result of phenocopy by the environment Different genes regulate the disease in different families Rheumatoid arthritis is controlled by a single X-linked recessive trait Rheumatoid arthritis is controlled by polygenic (or quantitative) traits Rheumatoid arthritis is controlled by a single autosomal dominant trait
Describe the methodology that you would use to determine the association between specific sequence variations or epigenetic modifications and observed diseases in humans. Given your newfound knowledge of this association how would you then design a genetic test that could be used to identify individuals within a given population who have developed the disease or at risk of developing the disease. “The disease” here refers to any heritable genetic disease..

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Concepts of Genetics (12th Edition)

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