Antagonistic coevolution
The costs of parasitism lead to antagonistic coevolution between hosts and parasites.
Hosts can evolve resistance (typically by closing the compatibility filter) or tolerance (focusing on resistance
this week).
Stahl et al. (1999): Arms races in a disease-resistance locus of Arabidopsis
Red Queen (cyclic)
new alleles arise frequently
frequency-dependent selection: rare alleles in the parasite, or host, have an advantage
resistance alleles tend to be monomorphic
different possible genetic systems: gene-for-gene, matching alleles, etc.
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