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Evolution
Environmental Biology
5
Biology
Undergraduate 4
03/01/2010

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Term
Homology
Definition
Possession by two or more species of a character state derived, with or without modification, from their common ancestor.
Term
Ancestral character state
Definition
The character state originally present in the ancestor of a given lineage. It may be retained or changed in descendants of that ancestor.
Term
Autapomorphy
Definition
A derived character that is restricted to a single lineage.
Term
Character
Definition
A feature, or trait.
Term
Character state
Definition
One of the variant conditions of a character (e.g., yellow versus brown as state of the character “color of snail shell”).
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