The fruit fly, Drosophila melanogaster, is one of the famous model system used to understand various aspects of life. This is largely due to several reasons like its short life cycle, easy handling, fully sequenced genome and a wide array of available tools. These important genetics tools exploited are discussed in this book to unravel the biological mysteries of growth and metabolism. The evolutionary conserved insulin and nutrient signaling network is centered on TOR kinase. The TOR kinase and its substrate S6 kinase (S6K) orchestrate cell-autonomous and hormone-controlled growth and also...