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Physical maps showing the relative locations of cloned DNA fragments in the genome are important resources for research in molecular genetics, genome analysis, and evolutionary biology. In addition to affording a common frame of reference for organizing diverse types of genetic data, physical maps also provide ready access to clones containing DNA sequences from any defined region of the genome. In this paper, we present a physical map of the genome of Drosophila melanogaster based on in situ hybridization with 2461 DNA fragments, averaging approximately 80 kilobase pairs each, cloned in bacteriophage P1. The map is a framework map in the sense that most putative overlaps between clones have not yet been demonstrated at the molecular level. Nevertheless, the framework map includes approximately 85% of all genes in the euchromatic genome. A continuous physical map composed of sets of overlapping P1 clones (contigs), which together span most of the euchromatic genome, is currently being assembled by screening a library of 9216 P1 clones with single-copy genetic markers as well as with the ends of the P1 clones already assigned positions in the framework map. Because most P1 clones from D. melanogaster hybridize in situ with chromosomes from related species, the framework map also makes it possible to determine the genome maps of D. pseudoobscura and other species in the subgenus Sophophora. Likewise, a P1 framework map of D. virilis affords potential access to genome organization and evolution in the subgenus Drosophila.

Genome structure and evolution in Drosophila: applications of the framework P1 map.