. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. GENES MODIFYING NOTCH. Notch has as its mate in the female an X chrom^jsome l)e^irinK oosin. Such a female crossed to an eosin brother gives 1 red-eyed Notch 9 : I. Fig. 94. eosin 9 : 1 eosin cf, and the expected number of cross-overs. The stock was kept running by breeding in every generation a number of short-Notch females to some of their eosin brothers, the eosin sisters being rejected. No special effort was made to pick out the shortest of the Notch females. The general run o
. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. GENES MODIFYING NOTCH. Notch has as its mate in the female an X chrom^jsome l)e^irinK oosin. Such a female crossed to an eosin brother gives 1 red-eyed Notch 9 : I. Fig. 94. eosin 9 : 1 eosin cf, and the expected number of cross-overs. The stock was kept running by breeding in every generation a number of short-Notch females to some of their eosin brothers, the eosin sisters being rejected. No special effort was made to pick out the shortest of the Notch females. The general run of the stock may be gathered from table 9 for the fourth, fifth, and sixth generations. For some time Table 9.—Short Notch. Notch Eosin Wild- Notch Eotiin E>)sin WUd- 9. 9. d". type cf. 9. 9. c^. ty|)e cT. 30 48 46 ¥,... 30 41 29 F«... 20 10 18 5 ¥,... 47 57 41 ¥,... 24 13 13 39 30 58 ¥,... 29 41 36 43 32 30 1 ¥,... 23 22 30 ¥,... 52 02 01 ¥,... 21 26 22 1 ¥ 54 54 59 1 84 71 78 29 27 31 ¥,... 4 27 24 1 F,... 18 24 30 I ¥,... 35 25 28 1 ¥,... 63 53 70 ¥ 30 53 34 F«... 80 55 00 I thought that short Notch might be an allelomorph of Notch—a difficult point to settle if it were, because there are no males of either class to bring the two allelomorphs together, and no other way of getting them into the same individual. But if the shortness of this tyix* is due to a modifying gene it should be carried by the not-Notch males a.^ well as by the female, and its presence could be demonstrated by 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 W
Size: 2116px × 1181px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectkaryoki, bookyear1919
