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Evolution
Pylogenetics
16
Biology
Undergraduate 2
10/03/2008

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Term
nodes
Definition
points where lineages split, ancestral ineage divides into two or more derived lineages
Term
Branches
Definition
represents poplulation through time
Term
Polytomy
Definition
node with more than 2 derived lineages (branches)
Term
Clade
Definition
ancestor and all lineages
Term
Monophyletic
Definition
ancestor and all descendants (clade)
Term
characters
Definition
traits used to show evolutionary relationships
Term
homology
Definition
similarities resulting from inheritance from common ancestor
Term
shared derived traits
Definition
derived- different from ancestral state (descent with modification)
shared- more than 1 taxa
Term
Plesiomorphy
Definition
ancestral character state
Term
Apomorphy
Definition
derived character state in 1+ descendents
Term
Synapomorphy
Definition
apomorphy shared by at least 2 descendents
-used to infer relationships
-define clades
Term
Symplesiomorphy
Definition
shared ancestral state
Term
Definition
derived character in only 1 taxon
Term
homoplasies
Definition
similarities not a result of common ancestor
Term
evolutionary reversals
Definition
distantly related taxa show similarities because of a reversal to ancestral (original) state
Term
Convergent evolution
Definition
distantly relatd taxa that evolve similar traits due to similar environments.
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