All issues
Successor
Volume 16 (1940)
- Issue 6 Pages 267-
- Issue 5 Pages 193-
- Issue 4 Pages 139-
- Issue 3 Pages 91-
- Issue 2 Pages 37-
- Issue 1 Pages 1-
Volume 16, Issue 3
Displaying 1-8 of 8 articles from this issue
- |<
- <
- 1
- >
- >|
-
Sukeichi FUJII1940 Volume 16 Issue 3 Pages 91-96
Published: June 20, 1940
Released on J-STAGE: March 14, 2011
JOURNAL FREE ACCESSA mutual translocation involving the Y and the second chromosomes was obtained by X-ray irradiation. The breakage of the second chromosome lies between the loci of the broken and brick and that of the Y chromosome is close to its distal end (Fig. 1). Both female and male individuals having the translocated chromosome IIp + Yd in extra are viable (Table 1 and 2). When such a fly carries the bobbed gene on the X chromosome, it shows an intermediate phenotype between the wild and bobbed (Fig. 6b). This is apparently due to the fact that the dominance of the wild allel of bobbed is reduced if the gene is contained in a translocated piece of the Y chromosome. Since the proximal halves of all the autosomes of D. virilis, except the sixth chromosome, are known to be made up of inert material, the extra chromosome seems to consist of a large part formed by the inert region of the second chromosome and a very small part formed by the Y chromosome. It is, therefore, concluded that the wild-type allel of bobbed is located close to the distal end of the Y chromosome.View full abstractDownload PDF (1213K) -
I. Histological researches on the reproductive organs of hybrid birds from the family Ploceidae.Yoshimaro YAMASHINA1940 Volume 16 Issue 3 Pages 97-105
Published: June 20, 1940
Released on J-STAGE: March 14, 2011
JOURNAL FREE ACCESSThe reproductive organs of four hybrids belonging to the Family Ploceida, (Ayes) mentioned below were studied from the histological viewpoint. These hybrids were considered in their life time to be sterile, and their exceedingly incomplete gonads proved it right.
(1) Padda oryzivora × Lonchura striata var. domestica.
Two females were examined. The ovaries were degenerated to a small gland-like body, consisting of a few abortive follicles among the connective-tissue (Figs. 1 and 5). The oviducts were also very incomplete in structure (Figs. 2, 3, 6 and 7). In one of the females the secretory glands were entirely absent in the wall of the duct.
(2) Lonchura atricapilla × Lonchura striata var. domestica.
One female was examined. The ovary and oviduct were degenerated far more than in the aforementioned, and the end of the Fallopian tube was closed (cf. Figs. 8-11).
(3) Erythura trichroa × Erythura psittacea.
One female was examined. In this case the ovary could not be found. The oviduct was also very incomplete, and the glands and muscles were not to be seen in its wall, though the end of the Fallopian tube was not closed (cf. Figs. 12-13).
(4) Aidemosyne modesta × Aidemosyne malabarica.
One male was examined. The seminiferous tubules were observed in the testes which were nearly normal in size (Figs. 14-16). In the majority of tubules there ranged only Sertoly's cells, but no germ cells (cf. Figs. 15-16). The interstitial cells were, on the contrary, much developed among the tubules (Fig. 16).View full abstractDownload PDF (3562K) -
Kyojiro SHIMAKURA1940 Volume 16 Issue 3 Pages 106-112
Published: June 20, 1940
Released on J-STAGE: March 14, 2011
JOURNAL FREE ACCESSThe Japanese quail, Cotuvnix coturnix japonica Temminck et Schlegel, has been fully domesticated as a pet bird in our country, since at least three hundred and fifty years. On the basis of such domesticated birds and wild ones, breeding was commenced about thirty-eight years ago in the direction of high egg-production; their eggs as well as meat are esteemed as delicacies and have rapidly gained an increasing demand on the market during these several years.
Among the breeds of the Japanese quail under domestication, several strains of unusual plumage characters have long been known, without drawing the attention of geneticists. In this paper a strain which has been established in our laboratory and appears to be identical with one of those old known strains has been studied genetically. The strain in question is characterized by its white plumage splashed with a small but indefinite amount of light brown feathers, 'olivaceous black (1) ' iris, and 'pale Persian lilac' bill, while the normal one has peculiarly brown plumage, 'brownish olive' iris, and brownish black bill (the colour names enclosed in quotation marks are in accordance with the nomenclature of Ridgway, 1912). The day-old chicks of these two strains are also unmistakably distinguishable by their down colours, one being white faintly tinged on the back with gray, and the other deeply brownish black with 'Naples yellow' or 'pinkish cinnamon' stripes on the dorsal side of the body and 'colonial buff' or 'Naples yellow' on the ventral side.
Throughout the experiments, the splashed white individuals behaved always as homozygotes for a single, Mendelian, autosomal, recessive gene, which has been named here “brown-splashed white” and symbolically designated as p. The dominant gene allelic to it of the normal strain has been named “Brown” and designated as p+.
The dominance of p+ over p is always complete and the heterozygotes p/p+ can never be distinguished phenotypically from the homozygotes p+p+.
The individuals of the brown-splashed white strain are commonly somewhat smaller in size and rather less active and less fertile than the normals so far in the present status of its breeding. These conditions possibly make the former less adapted for practical purposes than the latter.View full abstractDownload PDF (2022K) -
High non-disjunction observed between the deficient second chromosome in silkworm (Bombyx mori, L.).Tuneo TAKASAKI1940 Volume 16 Issue 3 Pages 113-118
Published: June 20, 1940
Released on J-STAGE: March 14, 2011
JOURNAL FREE ACCESSDownload PDF (932K) -
Tokio Hagiwara, Michio Nonomura1940 Volume 16 Issue 3 Pages 118-120
Published: June 20, 1940
Released on J-STAGE: March 14, 2011
JOURNAL FREE ACCESSDownload PDF (645K) -
Atusi Yamaura1940 Volume 16 Issue 3 Pages 120-123
Published: June 20, 1940
Released on J-STAGE: March 14, 2011
JOURNAL FREE ACCESSIn Japanese, the dimple appears with a frequency of 5%, and is inherited as a simple dominant.
The writer wishes to record his indebtedness to Professor R. Kawakami of the Public Hygienic Board, the Welfare Office (Kosyu Eisei-Tn, Kosei-Syo), for his valuable advices in this work.View full abstractDownload PDF (644K) -
Tanemoto FURUHATA, Kinjiro NODA, Tosiari KATAGIRI1940 Volume 16 Issue 3 Pages 124-125
Published: June 20, 1940
Released on J-STAGE: March 14, 2011
JOURNAL FREE ACCESSDownload PDF (332K) -
Akira Moriya1940 Volume 16 Issue 3 Pages 126-136
Published: June 20, 1940
Released on J-STAGE: March 14, 2011
JOURNAL FREE ACCESSDownload PDF (1023K)
- |<
- <
- 1
- >
- >|