Ritual mating behavior in fish matched directly to gene regulation in their brains. As cichlids (fish) build large castles or dig pit-shaped structures, specific genes get up-regulated. Are genes firing off signals to fire neuronal patterns and directly cause the behaviors?

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Ritual mating behavior in fish matched directly to gene regulation in their brains. As cichlids (fish) build large castles or dig pit-shaped structures, specific genes get up-regulated. Are genes firing off signals to fire neuronal patterns and directly cause the behaviors?