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1

Non-disjunction frequency in male complex Robertsonian heterozygotes of the common shrew

100%
Fedyk S., Chetnicki W.
Acta Theriologica
|
2010
|
tom 55
|
nr 1
1-8
Common shrews display two types of Robertsonian (Rb) heterozygosity: simple (where CIII configurations are formed at meiosis I) and complex (which have longer meiotic chains or rings). Based on an analysis of large sample sizes (over 100) of MII cells per specimen, we estimated the non-disjunction frequency in seven Rb homozygotes and 21 complex Rb heterozygotes (CIV and CV) of Sorex araneus Linnaeus, 1758. The analysis showed high betweenindividual variability. The mean level of non-disjunction in homozygotes (2.01%) was significantly lower than in CIV and CV heterozygotes (4.27% and 5.78%, respectively). The study demonstrated that non-disjunction frequency in male CIV and CV heterozygotes was similar to that in simple heterozygotes in the common shrew.
2

Distribution of Dileptus anser (Ciliata, Holotricha, Gymnostomatida) of various genotypes for mat locus in the concentration gradient of their gamones

84%
Afon'kin S. Y., Yudin A. L.
Acta Protozoologica
|
1987
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tom 26
|
nr 2
3
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Genetic analysis of selected tomato [Lycopersicon esculentum Mill.] traits in crosses between cultivated lines and the nor mutant

67%
Seroczynska A., Niemirowicz-Szczytt K.
Journal of Applied Genetics
|
1998
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tom 39
|
nr 3
The aim of the study was to investigate the delayed ripening caused by the nor gene and its possible interaction with selected traits observed in two combinations, namely, Dw₄ x nor and C36 x nor. The lines Dw₄ and C36 differed from each other in the majority of examined characters. There was no significant effect of reciprocal crosses on these characters (total yield, number of fruits, fruit weight, locule number, earliness and fruit shelf life). In Dw₄ x nor fruit weight was inherited with incomplete dominance of small fruit, while in C36 x nor the inheritance proved to be intermediate. This important statement made it possible to distinguish the hybrids characterised by fruit weight intermediate in relation to the parental forms. The experiments attested to the high significance of additive effects for fruit weight, periods from sowing to ripening and from flowering to ripening in both combinations and for locule number in Dw₄ x nor. It was also found that the nor gene slightly delayed the onset of fruit ripening but did not affect such traits as total yield, number and weight of fruits, locule number and period from sowing to flowering. In its homozygous state the nor gene totally inhibited fruit ripening. However, as a heterozygote it revealed an intermediate action, slowing down fruit ripening and prolonging shelf life 2-3 times as compared with standard tomato. The expression of the nor gene was also found to be dependent on the genetic background. Line C36 positively influenced the flavour and firmness of hybrid fruits, while Dw₄ had a negative effect on fruit quality.
4

Diagnostics and screening of cystic fibrosis

67%
Grade K., Grunewald I., Urner U., Coutelle C., Graupner I., Jung U., Bittner P., Nebelung W., Leucht B.
Bulletin of the Polish Academy of Sciences. Biological Sciences
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1993
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tom 41
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nr 4
5

Familial study of ataxia telangiectasia. Heterozygote identification on the basis of sensitivity of gamma-irradiated cultures to caffein post-treatment

51%
Pawlak A. L., Kotecki M., Ignatowicz R.
Bulletin of the Polish Academy of Sciences. Biological Sciences
|
1994
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tom 42
|
nr 3
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