ISSN:
1573-6857
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Two species of birds, the myna (Acridotheres tristis L.) and the jungle babbler (Turdoides malcolmi Sykes), have been studied cytologically. Their modal diploid numbers are 78±2 and 68±2 respectively. In T. malcolmi the heterochromatin is located on the centromeres of all the macros and most of the microchromosomes, heterochromatin comprises predominantly GC-sequences and at least one pair of microchromosomes is responsible for nucleolus organization. The occasional occurrence of silver deposition on more than one pair of microchromosomes suggests the possibility that more than one pair of micros may be associated with the synthesis of rRNA. The heterochromatin in A. tristis is AT-rich and restricted to the macro-chromosomes, though most of the micros are also C-band positive; no particular chromosome stains with silver nitrate, though when interphase cells are stained with acridine orange the nucleolus is surrounded by brightly fluorescing chromatin. Apparently unlike other species, the microchromosomes in the myna do not harbour NORs.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00115348
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