Identify points on these phylogenies where evolution appears to happen gradually, and points where it appears to happen rapidly. Is one pattern more predominant than another? If so, which and why? If not, why not? What could cause this?

Pattern and Process in Evolution.

2) Genetics and phylogeny reconstruction.

Turn to the right as you walk in and go to the wall display showing the invertebrate evolutionary tree.

1. Using the tree and the interactive displays, describe one example where recent investigation of genetic evidence has changed our understanding of phylogenetic relationship among invertebrate phyla.
2. Using the primary literature, find a second example of a surprising phylogenetic relationship that would have remained undiscovered without the ôModern Synthesisö.

3) Patterns of evolution

Location: Milstein Hall of Advanced Mammals, 4th. Floor.

Find the display on horse evolution. One display shows how G. G. Simpson envisioned horse evolution. A second shows a revised hypothesized evolutionary pattern.

1. Contrast these two phylogenies. How are they similar and how do they differ? What insights have occurred since SimpsonÆs work to lead us to the current view?
2. Identify points on these phylogenies where evolution appears to happen gradually, and points where it appears to happen rapidly. Is one pattern more predominant than another? If so, which and why? If not, why not? What could cause this?