BSsqans-lect07 phylo&syst

BSsqans-lect07 phylo&syst - BIS1B (Winter 2008)...

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BIS1B (Winter 2008) Study question answers: Phylogeny and Systematics Lecture 7 1. What is the difference between a clade and a monophyletic group? Both refer to the same thing: a clade (or monophyletic group) is a group of organisms that are all descended from a particular common ancestor. Moreover, the clade (or monophyletic group) includes all the descendants of that ancestor. 2. How might cladistic (phylogenetic) analysis of several closely related species indicate what mode of speciation has been important in their evolution? We could look at the distribution patterns of sister species (those that are one another’s closest relative). If, for example, sister taxa are always allopatric, or have only slightly overlapping geographic ranges, this indicates that speciation has been allopatric. 3. Which of the following animal groups is NOT monophyletic? (a) Chordata (b) reptiles (excluding birds) (c) reptiles (including birds) (d) invertebrates (e) Metazoa (b) and (d) 4. Assume that A, B, C and D represent four species in the phylogeny below (and no
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BSsqans-lect07 phylo&syst - BIS1B (Winter 2008)...

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