. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. THE ORIGIN OF GYNANDROMORPHS. 83 get to the bottom of the situation in the light of more recent work, for in moths it now seems probable that one Z sex chromosome (the equivalent in part of one nucleus) makes a female and two a male. There are, then, two kinds of ripe eggs, one with, the other without, a Z, and one kind of sperm, which is Z-bearing. There are six possi- bilities to be considered (see diagrams, text-figs. 66, 67, 68). (1) On Boveri's view (text-fig. 66, 1), if an egg wit
. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. THE ORIGIN OF GYNANDROMORPHS. 83 get to the bottom of the situation in the light of more recent work, for in moths it now seems probable that one Z sex chromosome (the equivalent in part of one nucleus) makes a female and two a male. There are, then, two kinds of ripe eggs, one with, the other without, a Z, and one kind of sperm, which is Z-bearing. There are six possi- bilities to be considered (see diagrams, text-figs. 66, 67, 68). (1) On Boveri's view (text-fig. 66, 1), if an egg with a W was the kind fertilized, then one half of the maternal segmentation nucleus should have no Z and would probably not develop, while the other. Text-figure 66. half of the egg nucleus, that united with the sperm nucleus, should have one Z and be both female and white. This explanation fails to account for the male sex of the side supposed to be without a Z and for the presence of zebra on that side. (la) On Boveri's view (text-fig. 66, la), if an egg with a Z were fertilized by a sperm (bearing Z),then both the male and female sides should be zebra, which is contrary to 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
Size: 3041px × 822px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectkaryoki, bookyear1919
