Premeiotic change of nucleolus organizer size in Neurospora. | Zendy

David K. Butler | Zendy; Robert L. Metzenberg | Zendy

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Premeiotic change of nucleolus organizer size in Neurospora.

Author(s) -

David K. Butler,

Robert L. Metzenberg

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/122.4.783

Subject(s) - biology , meiosis , neurospora crassa , genetics , tetrad , nucleolus , homologous chromosome , neurospora , chromosomal crossover , nucleolus organizer region , gene , cytoplasm , mutant

We have investigated the heritability of nucleolus organizer region (NOR) size in Neurospora crassa. By pulsed-field gel electrophoresis, we followed in genetic crosses the size of the normal or "terminal" NORs and the size of a small interstitial NOR. Tetrad analysis revealed that changes in NOR size occur frequently in the sexual phase. Moreover, most size changes occurred in the period between fertilization and meiosis, although some changes occurred during and after meiosis. Unexpectedly, increases and decreases in NOR size were not equally frequent: decreases were more common. The NOR size changes generated during meiosis were not the result of unequal crossing over between NORs on homologous chromosomes.

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