Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 15.1, Problem 1R
Summary Introduction
To review:
The differences between point mutations that cause phenotypic changes and those that do not cause phenotypic changes.
Introduction:
Point mutation refers to the mutations that usually affect only one
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Explain the difference between a gain-of-functionmutation and a dominant-negative mutation. Why areboth these types of mutation usually dominant?
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Life: The Science of Biology
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- Explain why loss-of-function mutations are frequently recessive, whereas gain-of-function mutations are frequently dominant.arrow_forwardDescribe what process leads to gene conversion. What are the consequences of gene conversion for carriers of genetic diseases, such as BRCA mutations?arrow_forwardA rare dominant mutation expressed at birth was studiedin humans. Records showed that six cases were discoveredin 40,000 live births. Family histories revealed that in twocases, the mutation was already present in one of the parents.Calculate the spontaneous mutation rate for this mutation.What are some underlying assumptions that may affect ourconclusions?arrow_forward
- Certain mutations are called dominant-negative mutations. What do you think this means and how do you suppose these mutations act?arrow_forwardWhat are the chances of occurrence of hypomorphic mutation?arrow_forwardWhich natural genetic mechanism is responsible for preventing the expression of genes that are likely to contain nonsense mutations?arrow_forward
- Alpha-1 antitrypsin has codominant inheritance. M genes express normal levels. S and Z genes have low expression. Which of the following is most likely to develop emphyema? A person with: 1) two M genes who does smoke 2) two S genes who does smoke 3) one M and one S gene who does not smoke 4) one M gene and one S gene who does smoke 5) two M genes who does not smoke 6) two S genes who does not smokearrow_forwardIn general, what are the differences between mutations and polymorphisms?arrow_forwardExplain the difference between a gain-of-function mutation and a dominant-negative mutation.arrow_forward
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Mitochondrial mutations; Author: Useful Genetics;https://www.youtube.com/watch?v=GvgXe-3RJeU;License: CC-BY