Genetics: From Genes to Genomes
6th Edition
ISBN: 9781259700903
Author: Leland Hartwell Dr., Michael L. Goldberg Professor Dr., Janice Fischer, Leroy Hood Dr.
Publisher: McGraw-Hill Education
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Chapter 20, Problem 23P
Families with germ-line BRCA1 or BRCA2 loss-of-function mutations usually display Hereditary Breast and Ovarian Cancer (HBOC). The accompanying diagram shows a BRCA2 pedigree.
| a. | BRCA1 and BRCA2 are tumor-suppressor genes; cells homozygous for loss-of-function mutations in either gene can become cancerous due to a loss of DNA repair machinery. Explain why the pedigree shows a dominant inheritance pattern of HBOC. |
| b. | Can you tell from the pedigree diagram whether or not HBOC is completely penetrant? |
| c. | Does HBOC show varying expressivity? |
| d. | Explain your answers to parts (b) and (c) in terms of current models for the origins of cancers. |
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Imagine that you are a clinical geneticist. Your colleague is an oncologist who wants your help explaining the basics of genetics to their patient, who will be undergoing genetic testing in the coming weeks for possible acute myeloid leukemia (AML) induced by the radiation she had several years ago for breast cancer.
Write a 1,050- to 1,225-word memo to your colleague.
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An explanation of the molecular structure of DNA and RNA, highlighting both similarities and differences
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An explanation of the differences between leading and lagging strands and how the DNA is replicated in each strand
Reponses to the following common questions patients might ask about this type of genetic testing and genetic disorder:
Does AML run in families?
What genes are tested for?
Respond to the following in a minimum of 175 words:
What are some potential consequences that could result if the processes of replication, transcription, and translation don’t function correctly?
Provide an example of how you might explain these consequences in terms that patients might understand.
Chapter 20 Solutions
Genetics: From Genes to Genomes
Ch. 20 - For each of the terms in the left column, choose...Ch. 20 - Characterize the differences between tumor cells...Ch. 20 - Prob. 3PCh. 20 - Prob. 4PCh. 20 - A carcinogenic compound is placed on the skin of...Ch. 20 - You have decided to study genetic factors...Ch. 20 - B cells are specialized blood cells that secrete...Ch. 20 - Molecules outside and inside the cell regulate the...Ch. 20 - Put the following steps in the correct ordered...Ch. 20 - a. Would you expect a cell to continue or to stop...
Ch. 20 - Two different protein complexes called SCF and APC...Ch. 20 - One of the hallmarks of mitotic anaphase is the...Ch. 20 - Concerning the Tools of Genetics Box Analysis of...Ch. 20 - Are genome and karyotype instabilities...Ch. 20 - Prob. 15PCh. 20 - Why dont all loss-of-function mutations that are...Ch. 20 - Chromothripsis is a rare phenomenon, first...Ch. 20 - The chromosome 9/22 translocation associated with...Ch. 20 - A female patient 19 years old, whose symptoms are...Ch. 20 - Prob. 20PCh. 20 - A generic signaling cascade is shown in the...Ch. 20 - Neurofibromatosis type 1 NF1; also known as von...Ch. 20 - Families with germ-line BRCA1 or BRCA2...Ch. 20 - The text explained that retroviruses can cause...Ch. 20 - Hepatocellular carcinoma is the most frequent form...Ch. 20 - Suppose that instead of microarrays, you analyzed...Ch. 20 - Prob. 27PCh. 20 - Glioblastoma multiforme GBM is the most common and...Ch. 20 - a. The legend to Fig. 20.29 identifies which of...Ch. 20 - The website CBioPortal http://www.cbioportal.org...
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