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⚖️ Frequency-Dependent Selection

Fitness depends on how common a phenotype is. Rare types may have advantages (negative FDS) or disadvantages (positive FDS), leading to polymorphism maintenance or fixation.

Generation: 0
Type A Freq: 0.50
Type B Freq: 0.50
Fitness A: 1.00
Fitness B: 1.00
Equilibrium: 0.50
Type A (blue morph)
Type B (orange morph)
Negative FDS: Rare types have higher fitness (predator avoidance, host-parasite, mate choice). Maintains polymorphism.

Positive FDS: Common types have higher fitness (predator mimicry, search image). Leads to fixation.