Nucleolar dominance and replicative dominance in Drosophila interspecific hybrids

Goodrich-Young, C.; Krider, H.M.

Nucleolar dominance and replicative dominance in Drosophila interspecific hybrids

1989

Goodrich-Young, C. | Krider, H.M.

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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Ключевые слова АГРОВОК

animals diploidy dna dna replication dominant genes drosophila drosophila melanogaster drosophila simulans gene expression genetics heterochromatin hybridization hybrids interspecific hybridization metabolism physiology repetitive sequences

Библиографическая информация

Опубликовано в

Genetics

Том 123 Выпуск 2 Нумерация страниц 349 - 358 ISSN 0016-6731

Другие темы

Nucleolus organizer region; Nucleic acid; Regulator genes; Crosses; Genetic; Genetic techniques and protocols; Blotting; Southern; Ribosomal; Genetic; Female; Genotype; Male; X chromosome

Язык

Английский

Примечание

2019-12-05

Тип

Journal Article; Text

В АГРИСе с: 2024-02-28

Формат: MODS

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