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Phlylogenetics- Bozemanbiology- Uriel M
Some general terms from Biology Concepts and Connections
20
Biology
10th Grade
05/06/2012

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Term
Phylogeny
Definition
The evolutionary history of a group of a species
Term
Homologies
Definition
similarities due to shared ancestry
Term
Convergent evolution
Definition
different evoultionary branches may come to resemble one another if they live in similat enviroments and natural selcetion favors similar adaptations 
Term
analogy
Definition
similaritys due to convergent evolution
Term
systematics 
Definition
a disioline of biology that focuses on classifying organisms and determining their evolutionary relationships.
Term
Linnaeus system
Definition
the first system of nameing and classifying species, it is not based on evolutionary relationships.
Term
Taxonomists 
Definition
biologists who identify, name, and classify species 
Term
Binomial 
Definition
the latin scientific name that is given to a species, first part is the genus, and the second is the species.
Term
Hierarchy of categories 
Definition

Domain, Kingdom, Phylum, Class, Order, Family, Genus,

Species   

Term
Taxon
Definition
each taxonomic unit (Domain,Order) at any level
Term
Phlogenetic trees 
Definition
What biologist traditionaly use to depict hypotheses about the evolutinary history of species
Term
Character Table 
Definition
A way to study a clade using a table with the characters on one axis and the Taxa on the other. 
Term
Cladistics
Definition
a method in systematics were evolutionary desent is the pirmary criterion  
Term
Clade 
Definition
a group of species that includes an acestral speceis and descendants.
Term
Monophyletic
Definition
inclusive group of ancestors and decendents, (it is what a clade is)
Term
Shared derived characters
Definition
New traits, the more of these that species have in common the more they are related in a cladistics point of view.
Term
Shared ancesteral characteristics 
Definition
the original traits present in ancestrial groups, 
Term
ingroup 
Definition
the group of taxa(Hiererchical groups) being analized in a caldistical study   
Term
Outgroup
Definition
a species that is from a different clade than the one being studyed, it is important to have outgroups to know what evoulutionary inovations determine the clade that is being studyed. 
Term
Parsimony
Definition
The quest for the simplest explation for the observed phenomena.
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