# Exam2 - Exam 2 Name TA Figure 1 The diversity of two sister...

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Exam 2 Name: TA: Figure 1. The diversity of two sister groups of organisms. The total area of the triangle represents the magnitude of diversity. Remember that total diversity at time t is N T = N 0 (O-E) T . 1) In the figure above, you can explain the difference in diversity of the two groups due to differences in A) the time the two groups have been evolving B) the rate of origination of lineages C) the rate of extinction of lineages D) all of the above E) B and/or C above 2) Using the axes provided, draw a hypothetical survivorship curve for a clade of organisms in which the probability of survival of lineages is less for younger taxa and increasing greater for older taxa. Make sure you label your axes.

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Figure 2. The geographic configuration of habitat (in black) separated by unfavorable habitat (open areas). Each labeled habitat “island” supports 2 distinct species so that across all four habitats there are a total of 8 species. 3) You will draw two phylogenetic trees (use the two Ys below as the base of each tree) for 8 species, 2 from each island. Label each species using the single letter code (A-D) and 1 or 2. So for example, the two species in habitat area A are A1 and A2. For the first tree, draw a phylogenetic tree supporting a dispersal-dominated biogeographic history, assuming area C is the oldest and the habitat areas are increasingly younger from left to right (D is the youngest). For the second tree, draw what you might expect assuming a vicariant history. 4) Evidence supporting the extraterrestrial impact hypothesis (as opposed to some other hypothesis) explaining heightened extinction rate at the end of the Cretaceous includes A) presence of high concentrations of a rare heavy metal (iridium) in 65 mya strata B) evidence for a spike in the abundance of fungi C) the extinction of most groups of dinosaurs D) all of the above E) only A and B above
5) Studies of modern representatives of the three domains of life (bacteria [B], archaea [A] and eukaryotes [E]) suggest that the last universal common ancestor possessed many different genes that presumably originated through repeated gene duplications. If you

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