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Chapter 7
Anatomy and Function of a Gene:
Anatomy and Function of a Gene:
Dissection Through Mutation
Dissection Through Mutation
Copyright © The McGraw-Hill Companies, Inc. Permission required to reproduce or display 7-1
Outline of Chapter 7
Outline of Chapter 7
What mutations are
What mutations are
How often mutations occur
How often mutations occur
What events cause mutations
What events cause mutations
How mutations affect survival and evolution
How mutations affect survival and evolution
Mutations and gene structure
Mutations and gene structure
Experiments using mutations demonstrate a gene is a
Experiments using mutations demonstrate a gene is a
discrete region of DNA.
discrete region of DNA.
Mutations and gene function
Mutations and gene function
Genes encode proteins by directing assembly of amino
Genes encode proteins by directing assembly of amino
acids
acids
Copyright © The McGraw-Hill Companies, Inc. Permission required to reproduce or display 7-2
What are mutations?
What are mutations?
Mutations a eritable changes in DNA
Mutations a eritable changes in DNA
sequences.
sequences.
Forward mutation – changes wild-type to a
Forward mutation – changes wild-type to a
different allele
different allele
Reverse mutation (reversion)– causes mutation to
Reverse mutation (reversion)– causes mutation to
revert back to wild-type
revert back to wild-type
Copyright © The McGraw-Hill Companies, Inc. Permission required to reproduce or display 7-3
Classification of mutations by their
Classification of mutations by their
effect on DNA
effect on DNA
Sub
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