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Volume 18, Issue 1
Displaying 1-5 of 5 articles from this issue
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II. Experiment of ovariotomy in the cross of Brown Leghorn and Barred Plymouth RockKiyoshi MASUI, Heizi MIYAMOTO1942 Volume 18 Issue 1 Pages 1-25
Published: 1942
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESSIt has been shown by several investigators that after the total ablation of the left ovary in the fowl the right gonad which is normally a minute rudiment, hypertrophies and forms an organ usually of testis-like structure. Why the right rudimental gonad, after removal of the left normal ovary, should develop to an organ of testis-like structure? The explanation given by Domm ('27, '30) is that the right gonad of the female chick is composed mainly of the medullary tissue of the embryonal gonad, which has the capacity of developing to the testicular tissue.
In the present study the same experiment as in the previous study in cross of different strains of the fowl was carried out, in order to verify the previous results which offered an important suggestion as to the determination of the sex in the fowl. As materials pure Barred Plymouth Rocks and crosses of Brown Leghorns and Barred Plymouth Rocks were used. As in a previous experiment ('40) the operation was performed successfully in very young chicks (10-25 days old).View full abstractDownload PDF (5768K) -
Kan-ichiro SUZUKI1942 Volume 18 Issue 1 Pages 26-33
Published: 1942
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESSThe “cray-fish pupa” is provided with two pairs of expanded wings, hence somewhat looking like a cray-fish (Astacus potamobius). The characteristic is evident in the pupal and imaginal stages, but not observable in the larva. The emergence of the adult and its mating seem to be more or less difficult owing to this abnormality, but the oviposition is usual because the sexual organs of the moths are normal.
Those pupae occurred for the first time in a large number, about one-fourth of the family, in F4 of a hybrid _??_ (Japanese bivoltine breed×European univoltine (Bagdad))×_??_ Japanese bivoltine breed.
By the crossing experiments with this mutant strain, I have come to the following conclusion.
(1). The cf gene is simple recessive against the normal.
(2). There is a linkage relation between cf and ch (chocolate larval colour gene), the crossing over value being calculated as 11.32% in the male and 0 in the female.
(3). This cf-ch linkage group proved to be independent from ten other linkage groups.View full abstractDownload PDF (843K) -
Sajiro Makino, Hidejiro Niiyama1942 Volume 18 Issue 1 Pages 34-40
Published: 1942
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESS -
Yoshimaro YAMASHINA1942 Volume 18 Issue 1 Pages 41-44
Published: 1942
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESSThe peahen, described herein was long been reared in the Koishikawa Botanic Garden, Tokyo, as a normal female having an egg-laying record. While moulting in 1938, she began to become male-like in the appearance of plumage, provided with well-developed upper tail-coverts (Fig. 1). She laid no eggs thereafter, and showed no active sexual behaviour. The bird was killed in the spring of 1941 for the purpose of anatomical and histological study of her reproductive organs.
The ovary was actually present in its proper position, measuring 23mm.×7mm. (Fig. 2). Its surface was apparently smooth, showing marked atrophy of follicles. The oviduct was also rudimentary.
Sections showed that a strong degeneration had taken place in the ovarian tissues: interstitial cells and connective tissue cells were developed to a high degree, while follicles with normal structure were entirely absent (Figs. 3-4). At the same time, it was ascertained both by macroscopical and microscopical observations, that sexual glands of any kind were entirely absent from the right side.View full abstractDownload PDF (1288K) -
Yataro TAZIMA1942 Volume 18 Issue 1 Pages 44-46
Published: 1942
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESSAmong the larvae of silkworm spontaneous mosaicism is not a rare occurrence and it is known to be highly accererated by some agents such as X-rays, temperature shocks, centrifuging and other extreme treatments. In the egg of this insect, however, spontaneous mosaicism has never been recorded even though several colouring genes had been known. As was previously reported, the present author has succeeded to obtain mosaic eggs by means of high temperature shock. Since then, he paid constant attention to find out mosaics in thousands of eggs, and succeeded, fortunately.
From a crossing of (Be2/Be2, re/re, Z+/W_??_×be2/be2, Re/Re, Zos/Zos_??_) F2 offspring is expected in a ratio of 9 black: 4 red: 3 brown. Among these F2 eggs two mosaics were found, which is shown in Fig. 1. As is clearly seen in the figure, anterior part of the egg was covered by red serosa cells and posterior by black cells, thus belong to an antero-posterior mosaic type. One of these two eggs (ms. 1) hatched out and completed its life cycle. The resulted caterpillar from this egg was a mosaic, whose left half of the body was os-translucent, while the other part was wholly normal. Therefore, it belongs to a bilateral type. The moth was, also, bilateral mosaic having black right and red left eyes. This individual was a female but laid no eggs after mating. As the plane of bilaterality of the embryo corresponds to the plane of symmetry of the egg, the antero-posterior mosaic egg ought to give rise to the same mosaic type in the caterpillar as well as in the moth. In the present case, however, the mosaic caterpillar and moth, resulted from the mosaic egg, was bilateral mosaic. Disaccordance of mosaic planes in the egg and later life remains unexplained.View full abstractDownload PDF (335K)
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