Competitive Phylogenetics


TitleCompetitive Phylogenetics
Publication TypeJournal Article
Year of Publication2014
AuthorsMcCabe, DJ
JournalThe American Biology Teacher
Volume76
Issue2
Pagination127 - 131
Date Published02/2014
ISSN00027685
Keywordsbranch, clade, cladistics, homology, homoplasy, morphology, natural taxon, node, Occam’s razor, out group, parsimony, Phylogeny, polytomy, root, sister group, synapomorphy, terminal node, transition
Abstract

This exercise demonstrates the principle of parsimony in constructing cladograms. Although it is designed using mammalian cranial characters, the activity could be adapted for characters from any group of organisms. Students score categorical traits on skulls and record the data in a spreadsheet. Using the Mesquite software package, students generate arbitrary cladograms and measure tree length. They then move taxa around to reduce tree length. The exercise can become competitive when students report out on tree lengths and try to achieve shorter trees than their peers. The resulting cladograms can be compared with a published mammalian phylogeny. The exercise illustrates phylogenetics, the principle of parsimony, and hypothesis testing using morphological data.

DOI10.1525/abt.2014.76.2.10
Short TitleThe American Biology Teacher
Status: 
Published
Attributale Grant: 
RACC
Grant Year: 
Year3