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  • Diploidization mechanism  (2)
  • RFLP  (2)
  • Springer  (4)
  • International Union of Crystallography (IUCr)
  • 1995-1999  (4)
  • 1996  (4)
Sammlung
Schlagwörter
Verlag/Herausgeber
  • Springer  (4)
  • International Union of Crystallography (IUCr)
Erscheinungszeitraum
  • 1995-1999  (4)
Jahr
  • 1996  (4)
  • 1
    Digitale Medien
    Digitale Medien
    Non-Mendelian and skewed segregation of DNA markers in wide crosses of the bean rust fungus,Uromyces appendiculatus (1996)
    Springer
    Current genetics 29 (1996), S. 159-167 
    Details
    ISSN: 1432-0983
    Schlagwort(e): Genetic linkage mapping ; Segregation distortion ; RAPD ; RFLP
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The inheritance of DNA markers was investigated in 27 F2 progeny from a single F1 hybrid derived from a wide cross inUromyces appendiculatus. This cross was unusual because asexual spores were used to fertilize sexual fruiting structures. Sixty percent of the DNA markers failed to segregate according to simple Mendelian ratios. Segregation bias was evident, in that F2 progeny inherited on average 91 % of maternal bands and 52% of paternal bands, which deviates significantly from the expected value for each of 75% for dominant markers. Because of these distortions, linkage mapping was not possible with this population. Evaluation of two F1s from a second wide cross, reciprocals obtained by normal fertilization, also showed non-Mendelian inheritance of one of three co-dominant RFLPs and five of six isozyme markers, indicating that the method of crossing was probably not responsible for the abnormal segregation patterns in the first cross. Either genetic incompatibility, similar to that of an interspecific cross, or selection of particular genotypes could explain the genetic anomalies reported here.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02221580
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Non-Mendelian and skewed segregation of DNA markers in wide crosses of the bean rust fungus, Uromyces appendiculatus (1996)
    Springer
    Current genetics 29 (1996), S. 159-167 
    Details
    ISSN: 1432-0983
    Schlagwort(e): Key words Genetic linkage mapping ; Segregation distortion ; RAPD ; RFLP
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  The inheritance of DNA markers was investigated in 27 F2 progeny from a single F1 hybrid derived from a wide cross in Uromyces appendiculatus. This cross was unusual because asexual spores were used to fertilize sexual fruiting structures. Sixty percent of the DNA markers failed to segregate according to simple Mendelian ratios. Segregation bias was evident, in that F2 progeny inherited on average 91% of maternal bands and 52% of paternal bands, which deviates significantly from the expected value for each of 75% for dominant markers. Because of these distortions, linkage mapping was not possible with this population. Evaluation of two F1s from a second wide cross, reciprocals obtained by normal fertilization, also showed non-Mendelian inheritance of one of three co-dominant RFLPs and five of six isozyme markers, indicating that the method of crossing was probably not responsible for the abnormal segregation patterns in the first cross. Either genetic incompatibility, similar to that of an interspecific cross, or selection of particular genotypes could explain the genetic anomalies reported here.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002940050031
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Synaptic behaviour of the tetraploid wheat Triticum timopheevii (1996)
    Springer
    Theoretical and applied genetics 93 (1996), S. 1139-1144 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Triticum timopheevii ; Synaptonemal complex ; Spreading ; Diploidization mechanism
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Triticum timopheevii (2n=4x=AtAtGG) is an allotetraploid wheat which shows a diploid-like behaviour at metaphase-I. The synaptic process was analyzed in fully traced spread nuclei at mid-zygotene, late-zygotene and pachytene. The length and type of synaptonemal complexes, as well as the number of bivalent and multivalent associations, were determined in each nucleus. A high number of bivalents per nucleus was detected at all three stages. Nuclei at pachytene showed a lower frequency of multivalents than did zygotene nuclei, which suggests the existence of a pairing correction mechanism. At metaphase-I only homologous bivalents and, rarely, one pair of univalents were observed. Similarities between the diploidization mechanism of T. timopheevii and that of allohexaploid wheat, controlled by chromosome 5B, are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00230137
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Synaptic behaviour of the tetraploid wheat Triticum timopheevii (1996)
    Springer
    Theoretical and applied genetics 93 (1996), S. 1139-1144 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Key wordsTriticum timopheevii ; Synaptonemal ; complex ; Spreading ; Diploidization mechanism
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Triticum timopheevii (2n=4x=AtAtGG) is an allotetraploid wheat which shows a diploid-like behaviour at metaphase-I. The synaptic process was analyzed in fully traced spread nuclei at mid-zygotene, late-zygotene and pachytene. The length and type of synaptonemal complexes, as well as the number of bivalent and multivalent associations, were determined in each nucleus. A high number of bivalents per nucleus was detected at all three stages. Nuclei at pachytene showed a lower frequency of multivalents than did zygotene nuclei, which suggests the existence of a pairing correction mechanism. At metaphase-I only homologous bivalents and, rarely, one pair of univalents were observed. Similarities between the diploidization mechanism of T. timopheevii and that of allohexaploid wheat, controlled by chromosome 5B, are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001220050347
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
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