TopicsPlant Developmental Bio
TopicsPlant Developmental Bio BIOL 471
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This 2 page Class Notes was uploaded by Era Schumm on Thursday October 15, 2015. The Class Notes belongs to BIOL 471 at Millersville University of Pennsylvania taught by Staff in Fall. Since its upload, it has received 11 views. For similar materials see /class/223540/biol-471-millersville-university-of-pennsylvania in Biology at Millersville University of Pennsylvania.
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Date Created: 10/15/15
BIOL 471 7 Methods in Systematics 7 Phylogenetic Inference Unit Counting Steps amp Ancestor Reconstruction using Parsimony 1 Score terminal species for character of interest Downward Pass 2 Starting at the tips of the cladogram start with two sister species and assign the intersection or union of the two to the node below them An intersection is where both descendants of the ancestral node have the same state therefore that state is assigned to the ancestral node A union is where the two descendants of the ancestral node have different states therefore both are temporarily assigned to the node 3 Work the same way from another pair of taxa down the tree until all nodes have been assigned an intersection or union COUNT THE NUMBER OF UNIONS after the downpass this is the most parsimonious length of that character on the cladogram Upward pass 4 Moving up the tree from the basalmost node for simplicitysake assume that the state possessed by the most distant outgroup taxon is the state at the basalmost node resolve any unions based upon the intersection with the lower node If there is not intersection for a particular node on the uppass then your data are ambiguous for that node THE STATES ASSIGNED TO NODES are one not necessarily the only one most parsimonious reconstruction of the state possessed by the hypothetical ancestor of that node s immediate descendants Now apply your method to determine 1 which is the most parsimonious tree on the next page and 2 the states for each character for each hypothetical ancestor in each tree BIOL 471 page 1 of2 am bar 2 char 3 BIOL 471 page 2 on