Chapter 25 Phylogenies

Chapter 25 Phylogenies - Chapter 25 Phylogenies 25.1...

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Chapter 25 Phylogenies 25.1 Phylogenies - description of the evolutionary history or relationships among organisms - root - common ancestor of all organisms - group of species – taxon - taxon consisting of all evolutionary decedents of a common ancestor – clade - 2 closest relatives species – sister species Comparisons among species - try to ascertain when traits evolved - can be used to infer environmental information - homologous – a feature shared by 2 or more individuals - vertebra is a homolog of all vertebrates - derived trait- trait different from ancestral trait - derived traits among a group of organisms used as evidence for common ancestry –synapomorphies - vertical column is a synapomorphyy of all vertebrates - independently evolved traits subjected to similar selection may become superficially similar –convergent evolution - character reverting from a derived state, back to ancestral state – evolutionary reversal - traits similar other than inheritance- homoplasies Constraints of Phylogenetic Trees
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This note was uploaded on 09/15/2009 for the course BIOE 20c taught by Professor Marinovic during the Summer '09 term at UCSC.

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Chapter 25 Phylogenies - Chapter 25 Phylogenies 25.1...

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