Vishnevskaia S S, Vsevolodov E B
Genetika. 1986 Apr;22(4):690-8.
Individual variability of the number and size of silver-staining nucleolar organiser regions (NOR) was studied in 76 pigs of Semirechenskaya, Big White and Duroc breeds. The variability of the NOR number is exclusively caused by the presence of the 8NOR- allele (the chromosomes of the 8th homologous pair lacking the silver-staining NOR). Concentration of the 8NOR- allele is about 0.7 in the average for all three breeds. All 7 offsprings from the homozygous parents male 8NOR- /8NOR- and female 8NOR+/8NOR+ were heterozygotes 8NOR- /8NOR+. These data, together with good agreement between found and expected (according to the Hardy-Weinberg law) frequencies of homo- and heterozygotes suggest the codominant character of the NOR number inheritance. This allows using the NOR analysis to control the parentage announced. The study of inheritance of the size of NOR did not prove unequivocally its codominant character.
在76头来自塞米列钦斯卡娅、大白和杜洛克品种的猪中，研究了银染核仁组织区（NOR）数量和大小的个体变异性。NOR数量的变异性完全是由8NOR-等位基因（第8对同源染色体缺乏银染NOR）的存在引起的。在所有三个品种中，8NOR-等位基因的浓度平均约为0.7。来自纯合亲本雄性8NOR-/8NOR-和雌性8NOR+/8NOR+的所有7个后代均为杂合子8NOR-/8NOR+。这些数据，以及所发现的纯合子和杂合子频率与预期（根据哈迪-温伯格定律）频率之间的良好一致性，表明NOR数量遗传具有共显性特征。这使得可以使用NOR分析来控制所宣称的亲子关系。对NOR大小遗传的研究并未明确证明其共显性特征。
