By E. O. Wiley, D. R. Brooks, D. Siegel-Causey, V. A. Funk, E. O. Wiley
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Additional resources for The Compleat Cladist: A Primer of Phylogenetic Procedures
Finally, we provide a very brief discussion of tree, current algorithms operate to produce optimal or near optimal trees. Hennig Argumentation You already have had practice Chapter 2. However, you did it at performing analyses using Hennig argumentation in a rather laborious in way, using the inclusion/exclusion principle. Hennig argumentation was the original phylogenetic algorithm, and its application is still common. For simple problems, Hennig argumentation presents no technical KU MUSEUM OF NATURAL HISTORY, SPECIAL PUBLICATION No.
2. 1 1 you will find that trees a and c have nine steps, and trees b and d have 10 steps. We accept trees a and c as the best estimates of the . phylogeny because they have a shorter length and thus the greatest number of statements of homology and the fewest number of statements of homoplasy for the data at hand. Note that such statements are relative only to trees derived from the same data set. The Auxiliary Principle coupled with the principle that there is only one phylogeny of life carried us to this Methodologically, point.
Hennig is simply suggesting that you sit back and let his method worry about convergences rather than doing something rash and ad hoc. xylem and phloem. With Hennig's Auxiliary Principle, you can deduce that plants that have xylem and phloem shared a common ancestor not shared with other plants. Of course, you don't make such a deduction in a vacuum. You "know" that more primitive Back to the xylem and phloem, and thus it's a good guess that having xylem and phloem is more derived than lacking xylem and phloem.