Tree thinking quiz D. A. Baum, S. D. Smith, and S. D. Donovan Each question in t

Question

Tree thinking quiz D. A. Baum, S. D. Smith, and S. D. Donovan Each question in this quiz is built around a Science paper that depicted a phylogenetic tree. It should not be necessary to consult the original article to answer the questions. 80-Sagittaria 99 Acorus E Trochodendron -Aquilegia 98 Saruma 93 Houttuynia 00Saururus 61 Piper 96 Canella8 Drimys 100carthus100 51 r -o-ldiospermunn- N100 57NHodycarya Hemandia Magnolla-17 Annona Nymphaea 100 Q 98 - 83 85Eupomatia 92 100 Cabombaceae- S. Mathews, M. J. Donoghue. The root of angiosperm phylogeny inferred from duplicate phytochrome genes Science 286, 947 (1999). 1) The figure above shows the phylogeny estimated for a sample of flowering plants (angiosperms) from PHYTOCHROME A and PHYTOCHROME C, a pair of genes that duplicated prior to the origin of the angiosperms. Which of the following sets of taxa constitute a clade (-monophyletic group) on one gene tree but not on the other? b) All angiosperms except Amborella c) Austrobaileya-Nymphaea-Cabombaceae d) Nelumbo-Trochodendron-Aguilegia

Explanation / Answer

A monophyletic group considers all descendants of a common ancestor. Nelumbo, Trochodendron, and Aquilegia all have a common ancestor and no descendants of that ancestor have been left out. Hence D is the answer Please post the original colored picture. ANSWER IS D. the last common ancestor of Micrixalinae and Dicroglassinae lived about a 100 mya, well before India and Madagascar separated. Please provide colored picture D IS CORRECT. Organisms of a group share similarity. Accordingly, V. cholera forms the most distance from Group A organism and has a common ancestor long back in time. Then evolved Group C Organisms hence Y. pestis has to be out-grouped leaving common ancestor for B and A

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