title: Inheritance of Ag-stainability of the nucleolus organizer regions in domestic sheep, Ovis aries.
abstract: One of the nucleolus organizer regions of sheep is located on chromosome 25, which forms one arm of a Robertsonian translocation chromosome (t3). By mating sheep heterozygous and homozygous for the t3 chromosome, and with various Ag-staining frequencies and deposit sizes, the heritability of the Ag-stainability could be determined. The inheritance of Ag-stainability was studied in 54 sheep in five pedigree groups. It was shown that the Ag-staining of a NOR is a heritable property. Matings of animals heterozygous for Ag-stainability provided an estimate of recombination frequency of the short arm of t3.
mesh_terms: D000818:Animals; D003433:Crosses, Genetic; D005260:Female; D005787:Gene Frequency; D006579:Heterozygote; D006720:Homozygote; D008297:Male; D009697:Nucleolus Organizer Region / Q000648:ultrastructure*; D011995:Recombination, Genetic; D012756:Sheep / Q000235:genetics*; D012834:Silver; D013194:Staining and Labeling
chemical_list: D012834:Silver