巻号一覧
57 巻, 3 号
選択された号の論文の8件中1～8を表示しています
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Hiroaki INOUE, Toshiki HIROYOSHI1982 年 57 巻 3 号 p. 221-229
発行日: 1982年
公開日: 2006/07/25
ジャーナル フリーLinkage analyses of sex-determining factors in a Fijian housefly strain, Suva Dump Fiji (SDF), were performed by using genetically marked autosomes. Although a Y chromosome could not be detected, the presence of at least three kinds of autosomal male-determining factors, IM, IIM and IIIM, was demonstrated in males of this strain. Both males and females of this strain carried the IIM-chromosome in the homozygous state. In addition, the females carried a fourth chromosomal female determining factor (F), which acts epistatically over the plural number of M factors.
It is known that no crossing-over occurs in normal XY-type housefly males. However, XX males heterozygous for the IM-chromosome extracted from the SDF strain and a acv bp marker chromosome produced recombinants with very low frequency. These recombinants seemed to be the resultants of male crossing-over at the meiotic cell stage. On the basis of male-recombination data, the M factor on the first chromosome was mapped on the right side of bp locus.抄録全体を表示PDF形式でダウンロード (428K) -
Toshiki HIROYOSHI, Yasuo FUKUMORI, Hiroaki INOUE1982 年 57 巻 3 号 p. 231-239
発行日: 1982年
公開日: 2006/07/25
ジャーナル フリーA dominant wing-shape mutation, Bx2 (Beadex2), occurring on the IIIM-chromosome was found in a wild-type housefly strain named Nagai. By backcrossing hybrid males between the Bx2 male and the third chromosomal mutant bwb ge females to the homozygous recessive mutant females, a new type of sex-limited strain designated as "bwb ge/Bx2 M(Nagai)" was established. The strain usually kept producing only male progeny with Bx2 phenotype and the female progeny with bwb ge phenotype, but the recombinant type offspring also segregated although the frequency was very low. Further analyses of these recombinants indicated that some of them were the resultants of crossing-over in the male parents, but the others were not. By using the male crossing-over data, the location of the male determining factor on the third chromosome was estimated to be the right side of ge locus.抄録全体を表示PDF形式でダウンロード (425K) -
Hiroshi IKEDA, Osamu MARUO1982 年 57 巻 3 号 p. 241-258
発行日: 1982年
公開日: 2006/07/25
ジャーナル フリーBidirectional selection for pulse repetition rate, or interpulse interval, Aipi, of the A courtship sound in Drosophila mercatorum successfully resulted in the low (LRR) and the high (HRR) pulse repetition rate lines and also the control, intermediate, line (CRR) was obtained. The response to selection was asymmetrical, the change in LRR being much greater than that in HRR. The fact that the response was not large for HRR may support Ewing (1977) who estimated the minimum interpulse interval of about 10 msec for the pulse sounds in Drosophila. The realized heritability which was estimated from the regression of the generation means on cumulated selection differentials for the first to the 11th generations was 0.32 for LRR and 0.14 for HRR. Correlated responses to selection were found for the number of pulses per burst, mating propensities, mating preferences, duration of copulation, the rate of development, the daily pattern of oviposition, pupation sites, larva to adult viability and the body size. The prominent feature was found for HRR, which was apparently different in those correlated responses from the other two lines.抄録全体を表示PDF形式でダウンロード (823K) -
II. Intragenic recombination at the Est-α locusKendo TSUNO1982 年 57 巻 3 号 p. 259-267
発行日: 1982年
公開日: 2006/07/25
ジャーナル フリーIn order to explore the mechanism of electrophoretic mutation due to intragenic recombination at the Est-α locus of Drosophila virilis, some selected alleles were repeatedly used in cross experiments. Some genotypes of female heterozygotes could produce several mutants, whereas others generated no significant number of mutants. Moreover, the directional nature of mutant occurrence was also confirmed as seen in the previous studies (Tsuno 1981). When newly arisen mutants obtained in the previous study were used in cross experiments, no increase in mutation rate was observed. From these observations, it is suggested that the majority of the mutations is due to intragenic recombination within introns rather than gene conversion. Thus, a general model for the Est-α locus is proposed.抄録全体を表示PDF形式でダウンロード (431K) -
Toshinobu MORIKAWA1982 年 57 巻 3 号 p. 269-279
発行日: 1982年
公開日: 2006/07/25
ジャーナル フリーNineteen double monosomics of Avena byzantina cv. Kanota (i.e. DMk-9 series) were obtained from 19 monosomics pollinated with another monosomic Mk-9. Several characteristics of the double monosomics lacking a chromosome 9 in common were examined. It was considered that a gene for awn formation is located on chromosome 8. There observed a non-allelic gene action for awn development between the epistatic suppressor gene on chromosome 9 and the promotor gene on chromosome 8. Selfed seed fertilities of DMk-9 series varied greatly, being divided into three fertility groups 0-10%, 22-39% and 45-65%. It suggests three different chromosome interactions between chromosome 9 and the other 19 chromosomes. The double monosomics which had high frequency of trivalent formations showed high selfed seed fertility in comparison with those which had high frequency of univalents. The progeny of double monosomics showing low selfed seed fertility had a tendency of nearing the euploid condition in chromosome number. From this study, 19 monosomes of hexaploid oats were identified.抄録全体を表示PDF形式でダウンロード (436K) -
Derepression of acetohydroxy acid synthase and repression of the valine-transport system by threonineToshihiko OKADA, Keiko SUGATA, Masao INOUE1982 年 57 巻 3 号 p. 281-295
発行日: 1982年
公開日: 2006/07/25
ジャーナル フリー1. Valine at a concentration of as low as 0.1μg per ml inhibited growth of strain W3110-215 (λ-F-thy-deoC-), a derivative of Escherichia coli K12, after shift-down from nutrient broth to minimal medium.
2. The inhibition by valine at this low concentration was overcome by 0.05 μg or more of isoleucine per ml.
3. On agar medium, valine-inhibition was reversed with unique recovery patterns by alanine, homoserine, leucine, methionine and threonine, suggesting the differences in their mechanisms of action.
4. Cells acquired resistance to 0.1μg of valine per ml on incubation for more than 40min in minimal medium containing threonine. The growth of these cells was still sensitive to 1.0μg or more of valine per ml. Cells incubated in the medium without threonine remained sensitive to 0.1μg of valine per ml throughout the incubation period of 6h.
5. The cells acquired resistance because threonine enhanced derepression of synthesis of acetohydroxy acid synthase, which is sensitive to valine, and maintained the repressed condition of the valine-transport system of the cells.抄録全体を表示PDF形式でダウンロード (700K) -
Kenichi AOKI1982 年 57 巻 3 号 p. 297-300
発行日: 1982年
公開日: 2006/07/25
ジャーナル フリーConditions are derived for altruism to evolve by the differential extinction of groups. The altruism is assumed to be determined by many loosely linked genes, acting additively within and between loci, and an independent environmental component.抄録全体を表示PDF形式でダウンロード (151K) -
Masa-Aki YAMADA, Saburo NAWA, Takao K. WATANABE1982 年 57 巻 3 号 p. 301-305
発行日: 1982年
公開日: 2006/07/25
ジャーナル フリーA mutant of a strain of the SR organisms (SRO, transovarially transmitted male-killing spiroplasmas) of Drosophila is described. The mutant, NSRO-A, has lost the male-specific killing activity on host flies, but maintains other properties such as the clump forming spectrum and the extractable titer of the associated virus as original NSRO strain.抄録全体を表示PDF形式でダウンロード (195K)
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