Nucleolar dominance and replicative dominance in Drosophila interspecific hybrids.

Abstract:

:The replication of the rDNA complement of only one nucleolus organizer region during polytene chromosome formation (replicative dominance) was initially observed in Drosophila melanogaster. Here we demonstrate replicative dominance in Drosophila simulans and D. melanogaster/D. simulans interspecific hybrids. A second nucleolar phenomenon, nucleolar dominance, is observed in the diploid tissue of interspecific hybrids. In this case only one of two nucleolus organizer regions forms a nucleolus. However, reorganizations of the X chromosome heterochromatin which eliminate nucleolar dominance have no apparent effect on the expression of replicative dominance. These observations lead us to conclude that nucleolar dominance and replicative dominance are operationally separable functions influencing the rDNAs, and may be determined by differing regulatory events.

journal_name

Genetics

journal_title

Genetics

authors

Goodrich-Young C,Krider HM

subject

Has Abstract

pub_date

1989-10-01 00:00:00

pages

349-58

issue

2

eissn

0016-6731

issn

1943-2631

journal_volume

123

pub_type

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