EARLY experiments1 had shown that wild-type stocks of Drosophila melanogaster carry different wild-type alleles at the sex-linked, white-eye (w) locus. A more recent2 detailed genetic analysis demonstrated that the w+ loci of the Canton-S(C) and Oregon-R(O) wild-type stocks differ in the right-hand two of the four recombinationally separate w+ loci. Thus C, and O may be described by the notation CC, and OO, where each letter represents two of the four loci. Derived wild-types carrying the right and left halves of the two stocks, that is CO, and OC, have been successfully synthesized.1
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Lawrence, M. J., Nature, 182, 889 (1958).
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GREEN, M. Effect of Different Wild-Type Isoalleles on Crossing-over in Drosophila melanogaster. Nature 184, 294 (1959). https://doi.org/10.1038/184294a0
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