bio phylogeny (main idea 2)
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8 Terms
what is used to construct phylogenetic trees or cladograms?
shared characters
what can be used to infer a phylogeny?
homologous characters (once they have been idenfided)
what do cladograms classify organisms by?
common descent
what is a shared derived character?
a trait shared by two or more organisms, which was inherited by a common ancestor
what is the outgroup?
the organisms that has diverged before the ingroup
— the outgroup does not have any shared characteristics with the group
each ingroup species is compared with the outgroup to..
differentiate between shared derived characteristics
in some trees, what can the length of a branch reflect?
the number of genetic changes that have taken place in a particular DNA sequence in that lineage
in other trees what can branch length represent?
chronological time and branching points can be determined by fossil record
Note 
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