University:
University of Cincinnati
Course:
BIOL 2084C | Evolution and Ecology
Academic year:

2023
Views:

163

Pages:

2
Author:

haiandlowzh21f

Tree of Phylogeny POGIL Key Ideas 1. Evolution is not a straight line; it is a branching process that started with a common ancestor and led to the organisms we see today. 2. Organisms are put into a "clade" based on how similar their shapes are. 3. Phylogenetic trees show how ancestors and their descendants share a common ancestor. Model 1 – Phylogenetic Trees 1. Refer to Model 1. a) How long ago did the common ancestor of all the organisms on this phylogenetic tree exist? b) Which two lines diverged 30 million years ago? c) List all modern descendants of the organism that was alive at the point indicated by the asterisk. Answer: a) Before/around 30 MYA b) Raccoon/Red Pandas & Bears/Giant Panda c) Spectacled, Sloth, Sun, Black, Polar, Brown Bears 2. According to Model 1, when did the Giant Panda line diverge from the line that led to modern bears? 3. According to Model 1, what animal shares the most recent common ancestor with the Brown Bear? 4. In a complete sentence, describe what the branch points and lines in a phylogenetic tree represent. Answer: 2. 15 – 20 MYA 3. The Polar Bear 4. The branch point represents common ancestor’s col shared traits; the lines represent the species that diverged from the common ancestor.