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Development in *Drosophila melanogaster* is one of the most well-studied models for understanding genetic control of development. The fruit fly shows a highly regulated sequence of events from fertilization to adult formation, controlled by interactions between maternal genes, zygotic genes, and signaling pathways. The process illustrates how genetic information is translated into body pattern formation and differentiation. The life cycle of *Drosophila* includes four main stages: embryo, larva, pupa, and adult. The most important genetic patterning events occur during embryonic development. Early embryogenesis begins ______ _________ __________ _________ ________ ____ _____ ________ ________ _________.
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