Heteromorphisms of Ag stained nucleolus organizer region [NORs] in acrocentric chromosomes of Egyptians
Bulletin of High Institute of Public Health [The]. 1996; 26 (4): 755-60
en Inglés
| IMEMR
| ID: emr-107171
ABSTRACT
The nucleolar organizer region [NORs] of the acrocentric chromosomes of 80 normal Egyptians [40 males, 40 females] were studied using the Ag-staining technique [NSG]. The Ag-staining of NORs varied from one individual to the other, yet a consistent pattern of Ag +ve NORs was present in each individual. The modal number of Ag +ve NORs per cell ranged from 6 to 10. The average modal number of Ag +ve NORs per individual was 7.65. No sex difference was observed in the sample studied. The size distribution of silver +ve NORs revealed that very large NORs occurred with a frequency of 7%. The frequency of large NORs was 24.13%, medium sized NORs was 30.75%, small sized NORs was 14.62%, while the frequency of absent NORs was 23.5%. A racial difference in the expression as well as in the size of NORs is proposed. Only one individual [1.25%] was identified as possessing a double NORs [dNORs]
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Índice:
IMEMR (Mediterraneo Oriental)
Asunto principal:
Cromosomas
/
Cromosomas Humanos
Límite:
Femenino
/
Humanos
/
Masculino
Idioma:
Inglés
Revista:
Bull. High Inst. Public Health
Año:
1996
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