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1

Cytogenetic variation in farmed stock of Dybowski's sika deer

100%
Jaszczak K., Parada R., Krzywinski A.
Folia Biologica
|
2004
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vol. 52
|
issue 1-2
53-56
EN
The chromosome constitution of Dybowski's sika deer was studied on the basis of 15 samples obtained from farmed stock maintained in an enclosure. The diploid chromosome number was 2n=68, 2n=67 and 2n=66. The constitutive heterochromatin (C-bands) was located in the centromeric regions of all acrocentric chromosomes. Metacentric chromosomes were C-negative. Chromosomes of three pairs proved to be NORs carriers. The size polymorphism of silver deposits was identified in two animals. A cytogenetic analysis indicated that the farmed stock of Dybowski's sika deer demonstrates considerable variation. The chromosome polymorphism observed may be a valuable marker for the management and preservation of this species.
2

Divergent selection for skeletal malformations in chickens alters polymorphism at microsatellite loci

88%
Wardecka B., Jaszczak K., Pierzchala M., Parada R., Korczak M.
Journal of Applied Genetics
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2004
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vol. 45
|
issue 1
61-71
EN
The objective of this study was to determine microsatellite polymorphism in Rhode Island Red (RIR) and Sussex (SX) chickens, divergently selected over six generations for high (H) or low (L) incidence of skeletal defects in embryos (30.7% for H lines, 3.7% for L lines). The polymorphism analysis covered 15 microsatellite markers within four lines (a total of 60 individuals). Eight alleles were identified as specific to H lines and six alleles as specific to L lines. The selection for skeletal malformation appears to have affected the frequency of microsatellite alleles. The experimental material examined constitutes a valuable source for identification of real genes causing skeletal defects.
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