Further studies on the ribosomal RNA cistrons of Sciara coprophila (Diptera).

Abstract:

:Additional experiments with homologous as well as heterologous hybridization confirmed our previous finding in Sciara coprophila that XX females have nearly twice the number of ribosomal RNA cistrons as XO males. A comparison between two different X' chromosomes revealed that only the one carrying the irradiation-induced Wavy mutation has a deletion of 70% of its ribosomal RNA cistrons as compared to the standard X. The deletion is relatively stable, and the remaining ribosomal RNA cistrons donot appear to undergo disproportionate replication or magnification as in Drosophila. Homologous hybridization experiments revealed an unusually low reiteration of ribosomal RNA cistrons in this fly, 45 gene copies per X chromosome. The question is raised as to whether such a low number of cistrons may be related to the unusual nucleolar condition encountered in the Sciaridae.

journal_name

Genetics

journal_title

Genetics

authors

Gerbi SA,Crouse HV

keywords:

subject

Has Abstract

pub_date

1976-05-01 00:00:00

pages

81-90

issue

1

eissn

0016-6731

issn

1943-2631

journal_volume

83

pub_type

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