Nucleolar dominance and replicative dominance in Drosophila interspecific hybrids. | Zendy

C Goodrich-Young | Zendy; Hallie M. Krider | Zendy

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Nucleolar dominance and replicative dominance in Drosophila interspecific hybrids.

Author(s) -

C Goodrich-Young,

Hallie M. Krider

Publication year - 1989

Publication title -

genetics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.792

H-Index - 246

eISSN - 1943-2631

pISSN - 0016-6731

DOI - 10.1093/genetics/123.2.349

Subject(s) - biology , dominance (genetics) , genetics , hybrid , interspecific competition , interspecific hybridization , interspecific hybrids , nucleolus , evolutionary biology , drosophilidae , nucleolus organizer region , drosophila melanogaster , gene , ecology , botany , cytoplasm

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.

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