The Japanese Journal of Genetics
Online ISSN : 1880-5787
Print ISSN : 0021-504X
ISSN-L : 0021-504X
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Volume 20, Issue 2
Displaying 1-5 of 5 articles from this issue
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  • Genetical studies on Habrobracon pectinophorae.
    I. Sex-linked inheritance and sex-determination.
    Fumie INABA
    1944 Volume 20 Issue 2 Pages 27-47
    Published: April 28, 1944
    Released on J-STAGE: March 14, 2011
    DOIhttps://doi.org/10.1266/jjg.20.27
    JOURNAL FREE ACCESS
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    1. The recessive mutant gene, ebony (body color), is sex-linked like fused in H. juglandis, worked on by Whiting and others, with the crossing-over value between ebony and the sex-determining factor ranging from 13 to 33 percent.
    2. The sex-linkage of ebony entirely disappears in out-crosses, but distinctly reappears by inbreeding even directly after out-crossing. This favors the multiple-allele theory suggested by Whiting more than Snell's multiple-factor theory of sex-determination in this material.
    3. These theories, are discussed, and a new 'compound sex-factor' theory is proposed.
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  • Genetical studies on Habrobracon pectinophorae.
    II. Mutant characters and their mode of inheritance.
    Fumie INABA
    1944 Volume 20 Issue 2 Pages 48-54
    Published: April 28, 1944
    Released on J-STAGE: March 14, 2011
    DOIhttps://doi.org/10.1266/jjg.20.48
    JOURNAL FREE ACCESS
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    29 mutant genes are briefly described. Of these 11 appeared spontaneously and the rest were induced by X-radiation. They include 10 wing characters, 5 antenna, 4 body color, 1 eye color and 1 eye shape characters ; 5 affect both wings and antennae, 2 both antennae and legs, while 1 Affects wings, antennae and legs.
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  • Chromosome conjugation in a rose hybrid, Rosa multiflora × R. rugosa.
    Hitoshi KIHARA
    1944 Volume 20 Issue 2 Pages 55-58
    Published: April 28, 1944
    Released on J-STAGE: March 14, 2011
    DOIhttps://doi.org/10.1266/jjg.20.55
    JOURNAL FREE ACCESS
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    Cytological studies on a species hybrid between two diploid Rosa-species (R. multiflora _??_ × rugosa _??_) were carried out. The hybrid is found to have 1-7 (mostly 5-7) pairs at first metaphase and the bivalents exhibit normal chromosome behavior throughout the course of the maturation divisions. The univalents split longitudinally in the first anaphase and they are distributed to the poles at random in the second anaphase.
    There should be no pairing of chromosomes at meiosis in this hybrids, as the parents belong to the different fundamental diploid species of Hurst (1928). After the classification of Hurst R. multiflora and R. rugosa have A- and C-septets respectively.
    The hybrid produced only empty pollen grains and the artificial pollination with multiflora-pollen gave no fruit. The sterility seems to be caused by physiological conditions affecting growth of the micro- and macrospores during the gametogenesis.
    It must be mentioned in this connection that Erlanon (1931) has made cytological studies on a species hybrid between R. rugosa (CC) and blanda (DD). Contrary to the expectation from Hurst's theory seven pairs of chromosomes at diakinesis were observed and the hybrid set good fruit.
    These findings do not support Hurst's theory of five differential septets in Rosa.
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  • Studies on the chromosomes of Chelidonium majus L.
    III. Variation of karyotypes found in plants coming from different localities.
    Seijin NAGAO, Isao MASIMA
    1944 Volume 20 Issue 2 Pages 59-63
    Published: April 28, 1944
    Released on J-STAGE: March 14, 2011
    DOIhttps://doi.org/10.1266/jjg.20.59
    JOURNAL FREE ACCESS
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    In the previous papers we have reported that the chromosome number of Chelidonium majus was 2n=10, instead of 2n=12, the number hitherto determined in the European race. Recently we found some variations of the karyotype in the material plants which were collected in different localities. The results obtained from the morphological comparison of the somatic chromosomes in these plants were described in the present paper. The karyotypes and their diagrammatic representations are shown in Figs. 1 and 2 on the pages 61 and 62.
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  • A linkage group in einkorn-wheat.
    Hitoshi KIHARA
    1944 Volume 20 Issue 2 Pages 64-67
    Published: April 28, 1944
    Released on J-STAGE: March 14, 2011
    DOIhttps://doi.org/10.1266/jjg.20.64
    JOURNAL FREE ACCESS
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    1) Since 1929 linkage studies were begun in order to get a fundamental knowledge to the genetics in einkorn-wheats, Triticum aegilopoides var. boeoticum and T. monococcum var. vulgare. The former species is assumed to be the standard type of the latter. The F1 hybrids showed in most cases aegilopoides- or nearly aegilopoides-characters.
    2) A linkage group involving 3 genes is established.
    sca1 (scabra)....One of the duplicate genes for pubescent leaf-blades. The phenotypes corresponding to the normal alleles of sca1 and sca2 are apparently different (Fig. 1). The gene is recessive to its normal allele+ of T. aegilopoides.
    gla1 (glabrescens)....One of the duplicate genes for hairiness of the rachis (Fig. 2). Recessive to its normal allele+.
    his (hispidulus)....A recessive gene for hairy nodes (Fig. 3). The normal allele+ of the gene is so far completely linked with a gene for pubescence on sheaths.
    3) The linkage relationship is shown in Fig. 4.
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