Anthropology5_Primitive_vs_Derived - Anthro5 Primitive:...

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18:02 Primitive vs derived similarities Primitive: trait present in the common ancestor of the group Derived: trait evolved since divergence from the common ancestor Pentadactyl (having 5 digits) is primitive for mammals o It should not be used to find natural groups of mammals o But having one toe is derived for mammals o So those that have one toe may represent a natural group. How to decide what is primitive and what is derived? Three methods: o 1. Fossil record if it occurs early it is primitive, if it occurs later, it is derived o 2. Out-group comparison out of group in a cladestic  the trait present in the out group is primitive derived traits share recent ancestors o 3. Order of appearance in development earlier in development is primitive This process can be repeated for other (phenotypic or genetic) traits. Dynamic of Social Evolution
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This note was uploaded on 08/25/2011 for the course ANTH 5 taught by Professor Gaulin during the Fall '07 term at UCSB.

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Anthropology5_Primitive_vs_Derived - Anthro5 Primitive:...

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