The aim of developmental biology is to discover how the genetic instructions for development are implemented by the epigenetic processes of development. In recent years Drosophila has been increasingly used to answer many questions concerned with development, and the imaginal discs have received special attention. These small nests of cells are set aside early in development for the formation of the adult integument. The entire surface of the adult fly is formed from imaginal discs so that any mutation that affects the cuticle of an adult fly directly or indirectly alters the development of imaginal discs. Many such mutations have been detected, described, and analyzed(180). This review exam ines the genetic basis of the development of the imaginal discs of Drosophila. Other aspects of Drosophila developmental genetics such as chromosome puffing (6), behavioral genetics (16a), genetics of embryogenesis (48, 351), spermatoge nesis (131, 156), oogenesis (159), and biochemical genetics (64, 307) have recently been reviewed.
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Postlethwait et al. (1973) studied this question.
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