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Throughout the animal kingdom, internal states generate long-lasting and self-perpetuating chains of behavior. In Drosophila, males instinctively pursue females with a lengthy and elaborate courtship ritual triggered by activation of sexually dimorphic P1 interneurons. Gustatory pheromones are thought to activate P1 neurons but the circuit mechanisms that dictate their sensory responses to gate entry...
Female sexual receptivity offers an excellent model for complex behavioral decisions. The female must parse her own reproductive state, the external environment, and male sensory cues to decide whether to copulate. In the fly Drosophila melanogaster, virgin female receptivity has received relatively little attention, and its neural circuitry and individual behavioral components remain unmapped. Using...
A new study in mice reveals that an apparently innate behavior, suckling, is triggered not by a classical pheromone but by the pup learning the complex signature odor of its mother.
Previous studies have shown widespread correlation between nucleotide polymorphism and recombination rate, but the cause of this correlation is unresolved. One explanation is that recombination is associated with point mutations, potentially through mutagenic effects of meiotic crossover. This hypothesis predicts that regions of frequent recombination should show both elevated nucleotide diversity...
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