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1

Cytogenetyczne aspekty specjacji zwierząt

100%
Fedyk S.
Kosmos
|
1987
|
tom 36
|
nr 3
2

Chromosomes of Microtus (Stenocranius) gregalis major (Ognev,1923) and phylogenetic connections between sub-arctic representatives of the genus Microtus Schrank, 1798

100%
Fedyk S.
Acta Theriologica
|
1970
|
tom 15
|
nr 1-12
3

Chromosomes of the Siberian mole (Talpa altaica Nikolsky, 1883)

63%
Fedyk S., Ivanitskaya E. Y.
Acta Theriologica
|
1972
|
tom 17
|
nr 32-38
4

Chromosomes of European bison, domestic cattle and their hybrids

63%
Fedyk S., Sysa P.
Acta Theriologica
|
1971
|
tom 16
|
nr 26-34
5

Chromosomes of Siberian shrews

63%
Fedyk S., Ivanitskaya E. Y.
Acta Theriologica
|
1972
|
tom 17
|
nr 32-38
6

Karyotypes of some species of Vespertilionid bats from Poland

63%
Fedyk A., Fedyk S.
Acta Theriologica
|
1970
|
tom 15
|
nr 13-23
7

Genetic differentiation of polish population of Sorex araneus L. I. variability of autosome arm combinations

63%
Fedyk S., Leniec H.
Folia Biologica
|
1987
|
tom 35
|
nr 1-2
8

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

63%
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.
9

Studies on the spermatogenesis in European bison and domestic cattle hybrids

63%
Fedyk S., Krasinska M.
Acta Theriologica
|
1971
|
tom 16
|
nr 26-34
10
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Content available

Drobne ssaki środkowego i dolnego basenu Biebrzy

51%
Raczynski J., Fedyk S., Gepczynska Z., Pucek M.
Zeszyty Problemowe Postępów Nauk Rolniczych
|
1983
|
tom 255
11

Chromosemes of some species of vespertilionid bats IV. New data on the plecotine bats

51%
Leniec H., Fedyk S., Ruprecht A. L.
Acta Theriologica
|
1987
|
tom 32
|
nr 11-20
12

Cases of coat colour anomalies in the common shrew, Sorex araneus L.

51%
Chetnicki W., Fedyk S., Bajkowska U.
Folia Biologica
|
2007
|
tom 55
|
nr 1-2
13

Sex chromosome meiotic drive in hybrid males of the common shrew [Sorex araneus]

51%
Fedyk S., Bajkowska U., Chetnicki W.
Folia Biologica
|
2005
|
tom 53
|
nr 3-4
14

Invalidation of Stobnica chromosome race of the common shrew Sorex araneus

51%
Fedyk S., Wojcik J. M., Chetnicki W., Maczewski S.
Acta Theriologica
|
2008
|
tom 53
|
nr 4
In Central Poland, two similar chromosome races of the common shrewSorex araneus Linnaeus, 1758 were earlier described: Drnholec race (arm combinationsgm, hi, ko, nr) and Stobnica race (gm, hi, ko, np). Great similarity in size and G-banding patterns between thenr andnp metacentrics leave open to doubt the actual existence of both races in Poland. The present study, which is based on good quality karyotypes of common shrews from 18 sites, showed the presence of thenr arm combination. There is therefore strong evidence that thenp arm combination was wrongly described and thus the Stobnica race should not be considered valid.
15

Reproductive performance in two hybrid zones between chromosome races of the common shrew Sorex araneus in Poland

51%
Banaszek A., Fedyk S., Szalaj K. A., Chetnicki W.
Acta Theriologica. Supplement
|
2000
|
tom 45
|
nr 1
16

Maximization of the frequency of recombinants in the hybrid zones of Sorex araneus in northern Poland

51%
Szalaj K. A., Fedyk S., Banaszek A., Chetnicki W.
Acta Theriologica
|
1995
|
tom 40
|
nr 3
We studied populations of Sorex araneus Linnaeus, 1758 in the upper Drwęca River valley and in the vicinity of Lake Szeląg Wielki. We found that the cline of frequency of metacentric np decays in the Drwęca River valley, which results in a smooth transition between the Stobnica race (karyotype hi, ko, gm, np) and the Laska race (hi, ko, gm). However, on the west shore of Lake Szeląg Wielki the cline of frequency of metacentric gm disappears. Reduction of frequencies of autosomes np and gm makes possible broadening of the ciines of metacentrics gr and mn, originating from the Łęgucki Mtyn race. This results in a reduction of the number of hybrids and maximization of frequency of recombinants (hi, ko, gr, mn), which reaches the value of 1.0 in the populations located on the west shore of the lake. We compared studied populations with those in the Pasłęka River valley, and those between the Pasłęka and Drwęca Rivers valleys. We also discussed the maximization of the frequency of recombinants as a mechanism enhancing fertility of hybrid populations.
17

Reassessment of the range of the Drnholec race: studies on meiosis in Sorex araneus hybrids

45%
Fedyk S., Banaszek A., Chetnicki W., Cichomska A., Szalaj K. A.
Acta Theriologica. Supplement
|
2000
|
tom 45
|
nr 1
18

Genetic differentiation and gene flow between the Drnholec and Legucki Mlyn chromosome races of the common shrew Sorex araneus in Northern Poland

39%
Ratkiewicz M., Supruniuk J., Fedyk S., Banaszek A., Chetnicki W., Szalaj K. A.
Acta Theriologica. Supplement
|
2000
|
tom 45
|
nr 1
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