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  • 1
    Electronic Resource
    Electronic Resource
    Meiotic segregation of five different reciprocal translocations in the onion fly, Hylemya antiqua (Meigen) (1981)
    Springer
    Chromosoma 81 (1981), S. 727-738 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract For one translocation (T14) with short interstitial segments in Hylemya antiqua significant differences in segregation behaviour between males and females were observed. In males the ratio of alternate:adjacent 1:adjacent 2 was approximately 7∶3∶0 and in females about 8∶1∶3. This difference is attributed to the difference in type of chromosome association. Female meiosis is chiasmate and male meiosis is achiasmate. It is suggested that meiotic pairing in males results in relative short “Coorientation Determing Distances” (CDDs) between homologous centromeres which favours alternate and adjacent 1 segregation. In females because of non-localized chiasmata on the average no differences in CDD between homologous and nonhomologous centromeres are expected. This might explain the occurrence of coorientation between non-homologous centromeres resulting in adjacent 2 segregations. Four other translocations with longer interstitial segments than T14 showed in males as well as females predominantly an alternate and adjacent 1 segregation, adjacent 2 was hardly found (0–3.6%). The longer distance between non-homologous centromeres is probably the reason.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329583
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  • 2
    Electronic Resource
    Electronic Resource
    Sex determination of the onion fly, Hylemya antiqua (Meigen) (1979)
    Springer
    Chromosoma 75 (1979), S. 353-367 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In testes of many XXY2 and XXY2Y2 males of Hylemya antiqua a numerical variation for Y2, a consequence of mitotic nondisjunction, has been established. In 22 of 79 progenies of XXY2 (including some unidentified XXY2Y2) males the ratio of females to males was significantly (p〈0.05) different from 1∶1, 9 with excess females and 13 with excess males. It could be concluded, firstly, that in progenies of XXY2 males sex ratio distortion results from a numerical variation of Y2 between the primordial germ cells of the male parent and secondly, that probably at least three primordial germ cells are involved in the formation of the male germ cells of the onion fly. Besides, the occurrence of some highly distorted sex ratios in male direction could be attributed to the presence of XXY2Y2 males. The frequency of M II cells with 2 Y2 chromosomes established in XXY2 males amounted to 2.9%. In XXY2Y2 males this percentage was higher and occasionally M IIs with 3 Y2 were found. In the progeny of one cross a chromosome morphologically identical with Y2 but lacking its holandric inheritance was found. From its inheritance, it could be concluded that it was a nonfunctional (mutated) Y2 chromosome (Ym). Interesting phenomena were the reduced transmission of Ym through the female, and the observation of very high numbers of Ym in some ovarian cells. A possible causal relationship between these two phenomena is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293477
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  • 3
    Electronic Resource
    Electronic Resource
    Fitness of a translocation homozygote in cage experiments with the onion fly, Hylemya antiqua (meigen) (1980)
    Springer
    Theoretical and applied genetics 57 (1980), S. 79-85 
    Details
    ISSN: 1432-2242
    Keywords: Hylemya antiqua ; Translocation homozygotes ; Genetic control ; Cage experiments ; Fitness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In Hylemya antiqua, a stock homozygous for an autosomal reciprocal translocation was isolated using egg-hatch reduction and karyotype analysis. Sibling translocation homozygous (TT) and heterozygous (T+) females were compared in respect to egg production and longevity. In one full-sib (5 TT and 8 T+ females) significantly higher values for both parameters for T+ than for TT females were scored, in four others (a total of 35 TT and 28 T+ females) no significant differences were found. Cage experiments were started with populations composed of equal numbers of wild type flies (++) and translocation homozygotes. The frequencies of the different karyotypes in three successive, non-overlapping generations, did not suggest substantial differences in fitness between ++ and TT flies. Possible causes of a surplus of T+ individuals found in these experiments are discussed together with the usefulness of the translocation for genetic control of H. antiqua.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00277769
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  • 4
    Electronic Resource
    Electronic Resource
    Meiotic disjunction and embryonic lethality in sex-linked double-translocation heterozygous males of the onion fly, Hylemya antiqua (Meigen) (1980)
    Springer
    Theoretical and applied genetics 58 (1980), S. 161-167 
    Details
    ISSN: 1432-2242
    Keywords: Hylemya antiqua ; Double-translocation heterozygotes ; Disjunction types ; Genetic control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The frequencies of disjunction types in double-translocation heterozygous males (262Y626XY2) in Hylemya antiqua have been established in MII cells and eggs of testcrosses. Several disjunction types occurred but four predominated. A correlation was found between the frequencies of the disjunction types and the relative position of the centromeres. The frequency of numerical non-disjunction (NND) was 4%. Differences in frequency of NND between sex-linked and autosomal translocations of H. antiqua are discussed. A good correspondence between the frequencies of unbalanced karyotypes, and embryonic and larval mortality was found. The total genetic load which can be induced by the T14/T61 males is estimated to be 60–65%. Some duplication/deficiency karyotypes appeared to be viable in pupal and even adult stages. In 26262Y6262X males a regular coorientation between 2Y and X was observed, in spite of non-homologous centromeres and a complicated synapsis of 2Y. Application possibilities of the present material for genetic control of H. antiqua are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263111
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  • 5
    Electronic Resource
    Electronic Resource
    Investigations of the inheritance of flower variegation in Mirabilis jalapa L. 3. Somatic chromosome number, 4. Distribution of the pigments and 5. Chromatographic studies (1975)
    Springer
    Euphytica 24 (1975), S. 6-12 
    Details
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The somatic chromosome number was found to be 58 for plants with uniformly coloured flowers as well as for plants with variegated flowers. It is concluded that flower variegation is not caused by variation of somatic chromosome number, if any. Yellow pigments occur in all cells of the flower, while violet pigmentation is restricted to the epiderm. Violet pigment is also limited to the epiderm of the hypocotyl and the lower epiderm of the cotyledon. In the epiderm of the flower in ordinary and glandular hairs and in the epiderm of the hypocotyl R can only manifest itself in the presence of Y, whereas in the lower epiderm of the cotyledon R can do so independent of Y. Yellow pigments are composed of several betaxanthins, whereas the violet pigment probably consists of one betacyanin. Y conditions the production of a precursor(s) of betaxanthins while R converts part of this (these) precursor(s) into betacyanin. In the lower epiderm of the cotyledon the production of betaxanthins is hampered. Their precursors are present and can be changed into betacyanin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00147162
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  • 6
    Electronic Resource
    Electronic Resource
    Investigations of the inheritance of flower variegation in Mirabilis jalapa L. 1. General introduction and 2. Inheritance of colour in uniformly coloured flowers (1975)
    Springer
    Euphytica 24 (1975), S. 1-5 
    Details
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Mirabilis jalapa plants are very showy through an abundance of reddish, yellowish, white and variegated flowers. The last phenomenon has fascinated various research workers. The authors have studied the inheritance and performed supporting investigations. In this paper a general introduction is given and the colour inheritance of uniformly coloured flowers discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00147161
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  • 7
    Electronic Resource
    Electronic Resource
    Investigations of the inheritance of flower variegation in Mirabilis jalapa L. 6. genetic system of flower variegation and speculation about its existence (1975)
    Springer
    Euphytica 24 (1975), S. 323-332 
    Details
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A genetic model for flower variegation in Mirabilis jalapa is given. Two loci effecting pigment production are assumed. The dominant alleles of each of these two loci may be repressed and thus they do not express themselves. In the presence of a dominant variegation gene a repressed allele can become active at some phase of the ontogeny of the plant. Repression and later release of repression results in a pattern of variegation of a dominant colour phenotype on the background of a recessive colour phenotype. Some parallels are drawn between the gene controlling system in M. jalapa and that in maize. In conclusion a practical application for plant breeding is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028197
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  • 8
    Electronic Resource
    Electronic Resource
    Investigations of the inheritance of flower variegation in Mirabilis jalapa L. 7. The colour of the cotyledons and the hypocotyl (1975)
    Springer
    Euphytica 24 (1975), S. 333-335 
    Details
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The inheritance and location of betacyanin production in the cotyledons and hypocotyl have been studied. In the cotyledons these pigments have been located in the lower epidermis. Their production is conditioned by R. In the hypocotyl these pigments have been found in the epidermis. Their production is induced by the complementary alleles Y (or active Yv) and R (or active Rv).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028198
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  • 9
    Electronic Resource
    Electronic Resource
    A male-linked translocation with high fertility in the onion fly Hylemya antiqua (Meigen) (1980)
    Springer
    Genetica 51 (1980), S. 111-114 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00133510
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  • 10
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    Sex determination of the onion fly,Hylemya antiqua (Meigen) (1978)
    Springer
    Details
    Publication Date: 1978-07-01
    Print ISSN: 0009-5915
    Electronic ISSN: 1432-0886
    Topics: Biology , Medicine
    Published by Springer
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