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Week 9 Briefing: Arms races

Whether the sanctioning and cheating-detection mechanisms from weeks 2–6 can honestly be called an arms race on the evidence a semester can show.

Stained arbuscular mycorrhizal structures inside a plant root, with a 50 micrometre scale bar.

Rajarshi Rit · CC BY 4.0 · Wikimedia Commons

Case file 09

Case file 09
Date
19 April 2027
Metaphor
Arms races — escalating measures and countermeasures between opposed interests
Phenomenon
Coevolution between exploitative strategies and the partner-choice and sanctioning mechanisms that oppose them

Before the session

Reread your week-4 or week-6 notes with one question in mind: what would the fungus need to evolve to stop this from happening, and is there evidence it has?

In the session

Build the coevolutionary story explicitly, step by step, and mark which steps are observed directly and which are inferred from present-day defence mechanisms alone.

Afterwards

Keep the observed/inferred distinction from this week active for the rest of semester — it recurs in week 11’s case study and in the Peace Conference.

The spec

What you bring to the session. Written so a reader can tell whether it has been met without asking you.

Teaching team