. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. 258 THE SECOND-CHROMOSOME GROUP LOCUS OF FRINGED. The black fringed stock, in combination with the recently mapped dominant star, offered a means of locating the position of fringed. A three-locus back-cross was started by mating a black fringed male to a star female and back-crossing the Fi star females by black fringed males. The three back-cross cultures (table 107) gave a total of 496 flies, of which 153 were non-cross-overs, 133 single cross-overs between star and black, 141 single
. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. 258 THE SECOND-CHROMOSOME GROUP LOCUS OF FRINGED. The black fringed stock, in combination with the recently mapped dominant star, offered a means of locating the position of fringed. A three-locus back-cross was started by mating a black fringed male to a star female and back-crossing the Fi star females by black fringed males. The three back-cross cultures (table 107) gave a total of 496 flies, of which 153 were non-cross-overs, 133 single cross-overs between star and black, 141 single cross-overs between black and fringed, and. Text-figure 82.—Fringed wing-margin. 70 were double cross-overs. The black fringed cross-over value was , which places fringed at practically the same locus as arc, which gave as the black arc cross-over value. To determine the locus more closely than this would require fringed- speck or fringed arc back-crosses, which have not been made. The only cross-over data on fringed are the values calculated from the star black fringed back-cross above, viz, S'b = , bfr = , 8% = Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington; Morgan, Thomas Hunt, 1866-1945; Bridges, Calvin B. (Calvin Blackman), 1889-1938; Sturtevant, A. H. (Alfred Henry), 1891-1970. Washington, Carnegie Institution of Washington
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