Evolution: Co-evolution Case Study

Having learned key vocabulary concepts about co-evolution and symbiosis, and with images of parasites fresh in our minds, we will now transition to the Infectious Organism Comic Strip Project.  Students will read through both the Infection Comic Strip Grading Rubric document, as well as the List of Infectious Organisms.  Students will select their preferred infectious organisms and submit their preference to the teacher for placement into groups.

To complete the day, students should visit the UC Berkeley Understanding Evolution website and read through the Coevolution and Case Study of Coevolution pages, then read through and take detailed notes from the Biological warfare and the coevolutionary arms race case study.  For the biological warfare case study, your notes should include complete answers to the questions on the first slide (also listed below).  Students should also complete the Science Article Summary Worksheet for the case study.

  • What is coevolution?
  • How do living and non-living environments shape organisms through natural selection?
  • How do evolutionary trade-offs restrict adaptation?
  • How can we use the methods of science to answer questions about the natural world?

Toxins: Molecular Views

Our work today involved thinking about solutions from a molecular perspective.  Students briefly reviewed yesterday’s Gummy Bear portion of the lab via the ChemCatalyst on slide 3 of the Lesson 81 PowerPoint.  Students then received the Lesson 81 Worksheet and the Particle Views Handout.  The handout was used in Part 1 of the worksheet.  For Part 2, students assembled into groups and gathered around lab stations to gain experience diluting a 3.0 M stock solution to a 1.5 M solution.  They also observed how two different volumes of a solution with the same concentration both appear the same color.  The lesson helped illustrate the connection between molarity (M), particle density, and the number of moles (particle number) in a solution.  Pictures from the white board are shown below.