What
is Phylogeny?
We will start this lab by Organizing/classifying
organisms.
Run EvoBeacker
Simulation. Discuss events. Then pose the question…how
do we know these relationships when no one was there
to watch them…cannot be there because it takes
too many lifetimes?
Genealogies: who are you most closely
related to? Brother/sister, then parents then…?
Relationship between species: Vertebrates?
Look at vertebrates
and tell me which ones share a common ancestor most
recently…or in other words, which two are the
most closely related
-
Thus, similarity equals common
ancestors. Why? Because decent
w/ modification…you inherit your DNA from
your parents
-
Same with organisms. They look
alike b/c they
inherited DNA from common ancestors, from parent
species.
So how do scientists
represent evolutionary relationships?
Homology versus
Similarity due to Convergence
-
Other
examples: fins, wings, others?
3
criteria
Students work on
Homology Worksheet - bone activities
LUNCH
Students finish Homology Worksheet -
bone activities
Demo Protein
visualization:
Procedure for
using Visualizing Protein Structure: Go to Entrez
Protein - search: “per2 NP_073728”.
Amino
Acid Phylogenetic Worksheet and Fish Gel review
Finish
with web search of more fish info to first evolutionary
fish tree.