Phylogenetic history

Waller RF, Patron NJ, Keeling PJ (2006) Phylogenetic history of plastid-targeted proteins in the peridinin-containing dinoflagellate Heterocapsa triquetra. Int J Syst Evol Micr... 

Each multiple sequences included in a common analysis has a common phylogenetic history with the others. 

Differences in the inferred phylogenetic histories of different portions of a gene have been used as evidence for concerted evolution involving part of a gene.35 A similar series of events may be occurring in ruminant lysozyme genes.11... 

Nesse My best answer is the slide where I showed the six different criteria by which one could define structures of the brain modules. I don t think we have any automatic way of choosing one in preference to others. I would say, however, that if an organism encounters a new adaptive challenge that is unprecedented in its phylogenetic history, then in that circumstance you might expect a fairly discrete mechanism, anatomically and physiologically, to be shaped. 

Thephylcgenetical value must be high, in the sense that all taxa must be monophyletic ( allparts of the taxon are descendants of one ancestral species) and that the hierarchy mirrors the phylogenetic history. 

In what way can the phylogenetic history of the group best be reconstructed This question can tn asked for its own scientific value but also in order to use the answer in the classification (see p. 7 under nr. 4). Phylogenetical research can be done on different taxon uni cal levels and with different means. The factual data on which to base the phylogenetical hypothesis are the same as those emerging from the character analysis that is used in classification. 

Chapter I is an overview of the aims of systematics. One challenge is the question What is the Natural Classification of the group under study The other challenge is the question What is the course of (phylogenetic) history that lead to this Natural Classification This chapter is meant as a perpetual question (yes, one question indeed) What am I doing as a taxonomist Don t read it once read it over again, and you ll read different matters in it as your experience grows. 

Each of the multiple sequences included in a common analysis has a common phylogenetic history with the others (e.g., there are no mixtures of nuclear and organellar sequences). 

In fact, so strong was the belief that fossils could do this, that for many workers fossils were essential if we were to understand the phylogenetic history of a group. Here are three quotes — note the years of authorship — to show that the belief is still with us. 

Albanesi, G.L. and Barnes, C.R. (2000) Subspeciation within a punctuated equilibrium evolutionary event phylogenetic history of the Lower-Middle Ordovician Paroistodus originalis -P. horridus complex (Conodonta)./o ma/ of Paleontology, 74(3), 492-502. 

Hedenas, L. (1999) How important is phylogenetic history in explaining character states in pleurocarpous mosses Canadian Journal of Botany, 77 1723-1743. 

Weeks, A., Daly, D.C., and Simpson, B.B., The phylogenetic history and biogeography of the frankincense and myrrh family (Bnrseraceae) based upon nuclear and chloroplast sequence. Mol. Phylogenetics... 

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