The Japanese Journal of Genetics
Online ISSN : 1880-5787
Print ISSN : 0021-504X
ISSN-L : 0021-504X
Search
Advanced search
OR
Browse
Search
Volume 42, Issue 2
Displaying 1-7 of 7 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • ON THE CHROMOSOMES IN SOME MOSSES
    KOJI YANO
    1967 Volume 42 Issue 2 Pages 83-88
    Published: 1967
    Released on J-STAGE: May 21, 2007
    DOIhttps://doi.org/10.1266/jjg.42.83
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The gametophytic chromosomes of 6 moss species are here reported. Their karyotype formulae are as follows:
    Acanthocladium japonicum Broth. et Par. K(n)=5=V(H)+2V+J+J(h)
    Acanthocladium nakanishikii Broth. K(n)=9=V(H)+4V+3J+J(h)
    Acroporium nipponense Sak. K(n)=8=V(H)+4V+2J+J(h)
    Ctenidium capillifolium (Mitt.) Broth. K(n)=11=V(H)+5V+4J+J(h)
    Drepanocladus uncinatus (Hedw.) Warnst. K(n)=11=2V(H)+5V+3J+J(h)
    Bryhnia tokubuchii Broth. K(n)=10=V(H)+6V+2J+J(h)
    View full abstract
    Download PDF (616K)
  • CHIASMA STUDIES IN STRUCTURAL HYBRIDS. VIII. FURTHER EVIDENCES FOR CHIASMA FORMATION BY CROSSING-OVER IN RECIPROCAL TRANSLOCATIONS OF SCILLA SCILLOIDES
    SHOZO NODA
    1967 Volume 42 Issue 2 Pages 89-93
    Published: 1967
    Released on J-STAGE: May 21, 2007
    DOIhttps://doi.org/10.1266/jjg.42.89
    JOURNAL FREE ACCESS
    Download PDF (1143K)
  • THE MORPHOLOGY OF PACHYTENE CHROMOSOMES OF SOME EU-SORGHUMS
    M. L. MAGOON, M. A. TAYYAB, R. S. SADASIVAIAH
    1967 Volume 42 Issue 2 Pages 95-107
    Published: 1967
    Released on J-STAGE: May 21, 2007
    DOIhttps://doi.org/10.1266/jjg.42.95
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The detailed morphology of the pachytene chromosomes and microsporogenesis have been studied in the six Eu-Sorghums. The pachytene chromosomes are depicted on the basis of total length, relative length, arm ratio, amount and distribution of heterochromatin and number and position of chromomeres. The characteristics of each of the ten pachytene bivalents in the haploid complement are described in detail bringing out similarities and differences amongst them. Based on the idiograms of the pachytene chromosomes, the possible role of chromosomes in speciation and the relationship amongst these Eu-Sorghums are discussed. Two basic archetypes in the 20-chromosomed taxa have been suggested-one with five long chromosomes and the other with five short chromosomes. It is proposed that the present day cultivated forms of Eu-Sorghums are allopolyploids of crosses between two such forms.
    View full abstract
    Download PDF (3761K)
  • POPULATION GENETICS ON THREE RACES OF DROSOPHILA AURARIA PENG
    III. GEOGRAPHICAL AND ECOLOGICAL DISTRIBUTION OF THE RACES, A, B, AND C, WITH SPECIAL REGARD TO ITS SPECIATION
    HARUO KUROKAWA
    1967 Volume 42 Issue 2 Pages 109-119
    Published: 1967
    Released on J-STAGE: May 21, 2007
    DOIhttps://doi.org/10.1266/jjg.42.109
    JOURNAL FREE ACCESS
    Download PDF (1641K)
  • THE EFFECTS OF X-RAY IRRADIATION ON SELECTION RESPONSE IN ôDROSOPHILA MELANOGASTER
    OSAMU KITAGAWA
    1967 Volume 42 Issue 2 Pages 121-137
    Published: 1967
    Released on J-STAGE: May 21, 2007
    DOIhttps://doi.org/10.1266/jjg.42.121
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    1. The number of abdominal bristles of D. melanogaster was selected in both high and low directions. The response of hybrid strains (Oregon-R×Samarkand) was generally higher than that of pure strains (Oregon-R), presumably because the former had higher genetic variability at the start of the experiment.
    2. Genetic variability, probably originating from mutation and recombination in polygenic systems, was induced by the irradiation, and contributed to the effectiveness of artificial selection. From the variance analysis, the grade of response of each lot was ranked as follows: both sexes treated=only males treated>only females treated> both sexes untreated. The possible difference in effectiveness between induced mutation and induced recombination is discussed.
    3. The mutation rates induced by X-rays, in terms of increments of variance, have been estimated from the selection responses. They are 28.1×10-5 (both sexes treated), 10.7×10-5 (only females treated) and 20.3×10-5 (only males treated) per unit dose, respectively.
    View full abstract
    Download PDF (1393K)
  • INDUCED MALE STERILITY IN JUTE (CORCHORUS CAPSULARIS L.)
    S. C. RAKSHIT
    1967 Volume 42 Issue 2 Pages 139-143
    Published: 1967
    Released on J-STAGE: May 21, 2007
    DOIhttps://doi.org/10.1266/jjg.42.139
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A slow growing male sterile mutant, 'Ribbon', was first observed in the M2 progenies of 70, 000 R treatment of the dry seeds of Corchorus capsularis L. Genetically, normal leaf trait was found to be dominant over 'Ribbon' trait and male fertility over sterility. The leaf variation is controlled by one factor pair and similar is the case with male sterility. The trend of fluctuation of pollen sterility in F2 population indicates the probability of the presence of two closely linked genes controlling the two traits.
    View full abstract
    Download PDF (3883K)
  • What I expect to Japanese geneticists
    Taku KOMAI
    1967 Volume 42 Issue 2 Pages 145-146
    Published: 1967
    Released on J-STAGE: May 21, 2007
    DOIhttps://doi.org/10.1266/jjg.42.145
    JOURNAL FREE ACCESS
    Download PDF (227K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top