The chromosomes of two Drosophila races: D. nasuta nasuta and D. nasuta albomicans III. Localization of nucleolar organizer regions
Tóm tắt
In the two Drosophila races D. n. nasuta and D. n. albomicans the nucleolar-organizer regions (NORs) have been localized on metaphase chromosomes by a combined acid treatment and silver-staining technique. In both Drosophila races one NOR is present on the heterochromatic Y chromosomes and another on the microchromosomes. Such a NOR distribution has not yet been reported in Drosophila. It is suggested that this distribution has evolved from an original type with NORs on the X and Y chromosomes.
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