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Genetics forms the foundation of biology and drives much biological research. Drawing from Caltech's distinguished legacy in genetics—where pioneers like Morgan, Beadle, Delbruck, Benzer, Wood, Lewis, and Hood established fundamental principles about genes, their functions, genetic pathways, and genome sequences—we now explore contemporary developmental and behavioral genetics. Using model organisms such as flies, worms, mice, yeast, Arabidopsis, and zebrafish, we investigate how genetics governs development, physiology, and behavior. With advances in genomics and genome editing, nearly any organism can now be studied genetically. At Caltech, our Genetics program equips students to grasp and employ genetic principles, from genome informatics to pathway and network analysis. We apply genetics to explore development, cell biology, physiology, behavior, and ecosystems.