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Chapter 2 Definitions
Chapter 2 Learning Objective Definitions
10
Biology
Undergraduate 4
02/22/2012

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Term
homology
Definition
similary resulting from descent from a common ancestor
Term
identity
Definition
extent to which two sequences are invarient
Term
similarity
Definition
quantative measure of degree of sequence match between two sequences
Term
substitution
Definition
replacing an amino acid with another amino acid
Term
insertion
Definition
inserting an amino acid into a chain
Term
deletion
Definition
removing an amino acid from a chain
Term
twilight zone
Definition
result of 15-25% identity when aligning two unrelated sequences
Term
gap opening penalty
Definition
penalty for opening a gap where none exists
Term
gap extension penalty
Definition
penalty for extendning an existing gap by one amino acid
Term
accpeted point mutation
Definition
values showing the probability of a change of one amino acid to another
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