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Frequency of Ag-stained nucleolus organizer regions in the acrocentric chromosomes of man

✍ Scribed by A. V. Mikelsaar; M. Schmid; W. Krone; H. G. Schwarzacher; W. Schnedl

Publisher: Springer
Year: 1977
Tongue: English
Weight: 252 KB
Volume: 37
Category: Article
ISSN: 0340-6717
DOI: 10.1007/bf00293774

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✦ Synopsis

The Ag-stainability of the nucleolus organizer region (NOR) was studied in the acrocentric chromosomes identified by Q-banding of cultured lymphocytes in 51 karyotypically normal persons (31 males and 20 females). A consistent pattern of Ag-positive NORs was found in each individual. Ninety percent of individuals have a model number of 8--10 Ag-positive NORs per cell. The frequency of Ag-positive NORs is similar in all five acrocentrics. A statistically nonsignificant lower frequency is found in chromosome 22. Ag-negative NORs on both homologues were found in four cases. The observed frequency distribution of individuals with homozygous NOR-positive, heterozygous, and homozygous negative acrocentric chromosomes was in accordance with the Hardy-Weinberg law in all five pairs of the acrocentric chromosomes as well as in total. No sex difference was observed on our material.

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