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1

Description of the Anser anser goose karyotype

100%
Wojcik E., Smalec E.
Folia Biologica
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2007
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vol. 55
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issue 1-2
35-40
EN
The karyotype of the Italian goose originating from Anser anser was characterised on the basis of R and C bands. Chromosomal preparations obtained from an in vitro culture of blood lymphocytes were stained with the RBG and CBG techniques. The RBG technique enabled the analysis of the structure of nine pairs of chromosomes whereas the CBG technique ? fourteen pairs of chromosomes from the total of eighty goose chromosomes. The morphology and the R and C banding patterns were described. The size and arrangement of the blocks of constitutive chromatin were determined. Ideograms of R and C banded patterns were drawn. The morphological structure of the analysed chromosomes was evaluated.
2

The structure of the synaptonemal complexes in meiocytes of European domestic goose (Anser anser)

100%
Andraszek K., Smalec E., Czyzewska D.
Folia Biologica
|
2008
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vol. 56
|
issue 3-4
139-147
EN
The synaptonemal complex (SC) is a protein structure which binds two homologues during rophase of the firstmeiotic division and assures the correct course of genetic recombination. The demonstration and identification of SCs in European domestic goose Anser anser was the aim of the current research. Standard techniques of SC identification do not allow for an analysis of their molecular structure. In meiotic cells of one-day-old nestlings and 17-week-old geese the haploid number of bivalents, darkly stained kinetochores and subtelomeric regions may be evidence for the presence of SCs. Experimental chromosome staining with the DAPI fluorochrome permitted the observation of the characteristic ladder-like structure of SCs and the course of synapsis formation within homologues from early leptotene to their degradation in late pachytene. The detailed molecular structure of synaptonemal complexes can be analysed with an electron or scanning microscope only. Because the bivalent is a direct result of the complex.s presence, in the literature the presence of bivalents is equivalent to the term.synaptonemal complex.. However, the bivalent and the SC are two different structures.
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