The appendages that protrude from a mosquito’s head hold the sensory systems that account for nearly all of its ability to detect and respond to a wide range of chemical signals that are critical for its reproduction and its survival. At the molecular level, these systems rely on genes that make up three families of chemosensory receptors. These genes include gustatory (taste) receptors, ionotropic receptors and odorant receptors that collectively facilitate a wide range of essential behaviors.
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Source: Phys.org