遺伝学雑誌
Online ISSN : 1880-5787
Print ISSN : 0021-504X
ISSN-L : 0021-504X
27 巻, 5-6 号
選択された号の論文の9件中1~9を表示しています
  • Kyoji Kondo
    1952 年 27 巻 5-6 号 p. 131-141
    発行日: 1952年
    公開日: 2007/05/21
    ジャーナル フリー
    1) The external genital organs of hermaphroditic goats are of various types of abnormality. In most of them, the clitoris project prominently and resemble the glans penis, while the scrotum and body of penis are not present. In some animals, the clitoris are developed so conspicuously as the penis, and the scrotums are found, but they are malformed, while in others the external genital organ is of female type.
    2) By anatomical observation, in all animals examined, there exist both Mullerian and Wolffian ducts, and their grades of development and differentiation are in accordance with those of the gonads and the other secondary sexual characters. The gonads in them are ovotestis in female type and testis-like in others. Between these two, there are numerous histological deviations. Based on these morphological observation, it can be decided that the hermaphroditic goats are true hermaphroditisms.
    3) To determine the genetical sex of the intersex, sex-ratio and the frequency of occurrence in litters are calculated. The observed data agree well with the fact that the intersexual goats are female genetically and the frequency of occurrence of intersexual kids between carrier×carrier mating must be 12.5%. Based on these facts, it is concluded that the gene of intersexuality is an autosomal and acts in female only when homozygous.
  • Hisatoshi Mitsuda, Syogo Inoue, Yasuhiko Kazama
    1952 年 27 巻 5-6 号 p. 142-147
    発行日: 1952年
    公開日: 2007/05/21
    ジャーナル フリー
    1. Zu dem bisher von G. S. Dow und C. I. Poynter berichteten einzigen Fall von rezessiv-geschlechtsgebundener Taubstummheit wind hier ein weiteres Beispiel beschrieben.
    2. Wir vermuten, dass sick dieser Biotypus auch in seiner phänotypischen Manifestierung von der einfachen rezessiven unterscheidet, indem sich bei allen taubstummen Personen der vorliegenden Familie deutlich Störungen der Labyrinthfunktion festsellen lassen.
    3. Es wurde der Versuch gemacht, unter den Mitgliedern der Sippe den möglichen Ursprung der Mutation des betr. Gens festzustellen.
  • The formation of micropollen grains, with some notes on spontaneous chromosome aberrations in Allium odorum
    Yukio Kato
    1952 年 27 巻 5-6 号 p. 148-156
    発行日: 1952年
    公開日: 2007/05/21
    ジャーナル フリー
    ニラ (Allium odorum) の花粉形成時において細胞質に存在するフオイルゲン陽性小体が研究された. この小体は橢円形又はリング状で一細胞当りの出現する数は1~7でその大いさは2.3~5.8μ (平均3.9μ) である. 一核性花粉粒及び二核性花粉粒の時期を除いてこの小体をもつ細胞の出現頻度は調査した細胞の約6.7%に当りほゞ一定している. 花粉形成に当りこの小体は母細胞から分離された小形花粉粒 (Micropollen grain) の核として存在する. この小体をもつ場合は花粉粒の核の分化が著しく遅れることがある. 従つて正常な花粉形成にはこの小体は障害物となるように思われる. この小体の出現は減数分裂の異常性とは全く無関係である.
    一つの葯における分裂相の同時性と染色体切断, 分裂相の非同時性とその他の異常 (例えば非対合, 遅滞染色体, 多核性細胞形成等) とは互に密接な関係がある. おそらく染色体切断とこれらの他の異常とは互に別な機構によつて出現するものと考えられる.
  • Teisaku KOBAYASHI, Tamaki SHIMAMURA
    1952 年 27 巻 5-6 号 p. 157-171
    発行日: 1952年
    公開日: 2007/05/21
    ジャーナル フリー
    1) Induced polyploidy in Sesamum indicum L. by the colchicine method is described; two different methods, namely the immersion and dropping, were used, the latter proving more effective than the former.
    2) As the characteristics of autopolyploidy, the tetraploid plants were extremely robust, with much thicker stems, larger leaves, stomata, flowers, and seeds than the diploids.
    3) The fertilities of pollen grains and seeds per capsule from the tetraploids were comparatively high with averages of 74.10% and 77.74% respectively. But the yield of seeds per plant of the tetraploids was unfavorable.
    4) Details of meiosis in diploid and tetraploid S. indicum, especially on secondary pairing, have been recorded.
    On the nature of secondary polyploidy in S. indicum was discussed.
  • 野田 昭三
    1952 年 27 巻 5-6 号 p. 173-175
    発行日: 1952年
    公開日: 2007/05/21
    ジャーナル フリー
    Root-tips of Allium cepa L. were pretreated with 0.5 per cent aqueous solution of chloralhydrate, fixed with La Cour 2BE, stained by Feulgen's technique and squashed in 45% acetic acid. The chromosome number is found to be 2n=16, of which 2(S1S1 type, Fig, 1a) or 3 chromosomes (S1S1S2 type, Fig. 2a) being nucleolar. The former type is one reported repeatedly by the previous workers. The latter is found newly by the present study. These two types showed maximum number of nucleoli 2 and 3 (Figs. 1b, 2b) respectively according to the number of nucleolar chromosomes contained. Both size of satellite and length of connecting filament showed a considerable variation between indivduals, between cells of one and the same individual (Fig. 3b) or even between homologues within a cell (Figs. 1a, 3a). Among 50 bulbs studied, 10 revealed to be S1S1S2 type, 36 to be S1S1 type and the remaining 4 were not identified as to this point. The new type nucleolar chromosomes, S, is suggested to originate from some structural rearrangement or from some alteration in the balance of nucleolar-forming capacities between the chromosomes in the nucleus.
  • ハツカネズミによる表現型模写の研究 (第一報)
    村上 氏廣
    1952 年 27 巻 5-6 号 p. 176-183
    発行日: 1952年
    公開日: 2007/05/21
    ジャーナル フリー
    Seizo Katsunuma (1948) described that some congenital abnormalities such as pseudencephaly, spina bifida, anophthalmia, harelip, heart abnormalities etc. were occasionally found in rodents embryos whose mother animals had been injected intravenously with some vital staining dyes, namely lithioncarmin, trypanred or trypanblue etc. He presumed that such congenital abnormalities might be caused either by the abnormal permeability of the placenta with vitally stained syncytium cells or by the toxic effects of these staining agents.
    Having succeeded his experiments the author studied the critical period of these abnormalities and various conditions for their manifestation.
    Methods: Female mice on the 9th-11th day of pregnancy were injected with 2.5-4.0% lithioncarmin solution intravenously once every day for 3 or 4 days.
    Results: 306 embryos of the 14-16th foetal days were obtained from 42 mother animals by vivisection. Among these embryos abnormalities as follows were found, 2 pseudencephalies, 3 slight oxycephalies (one of them with r-cerebrum hypoplasia), 2 with back blisters … myelencephalic blebs? … (one of them furthermore with blood-blister on the back of the left fore feet) (and these above mentioned embryos were all alived), 1 spina bifida, 1 severe oxycephaly, 3 microcephalies (these died on the 12-13th foetal days), 32 small chorions and 7 placentas without embryos (partial sterility).
    Among 266 control individuals obtained from 37 normal mother animals no marked abnormality was seen except some small chorions.
    The author presumes therefore the critical period of manifestation of these abnormalities to be in the 9th-11th foetal days, namely in the period in which from one to several primitive segments are formed. It is not yet decided whether the appearance of these abnormalities should be ascribed to the abnormal permeability of the vitally stained placenta or to the toxic effects of the vital staining dyes. The experiments will be continued.
  • 田中 信徳
    1952 年 27 巻 5-6 号 p. 185-190
    発行日: 1952年
    公開日: 2007/05/21
    ジャーナル フリー
  • 川村 智治郎
    1952 年 27 巻 5-6 号 p. 191-196
    発行日: 1952年
    公開日: 2007/05/21
    ジャーナル フリー
  • 駒井 卓
    1952 年 27 巻 5-6 号 p. 197-200
    発行日: 1952年
    公開日: 2007/05/21
    ジャーナル フリー
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