The nucleolar organizer of Plethodon cinereus cinereus (Green) View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1973-12

AUTHORS

H. C. Macgregor, James Kezer

ABSTRACT

The 7th longest lampbrush bivalent in oocytes of Plethodon cinereus cinereus has a region of attached oocyte nucleoli near to the centromere on the shorter arm of each half bivalent. When squash preparations of P. c. cinereus spermatocytes are treated with NaOH to denature chromosomal DNA, and subsequently incubated in a solution of (3H) ribosomal RNA from Xenopus cell cultures, the ribosomal RNA binds specifically to a region near the centromeres on the shorter arms of the 7th longest bivalent, and to a region near the end of the shorter arm of the 14th bivalent. The amount of ribosomal RNA bound to the 7th bivalent at diplotene and 1st meiotic metaphase is regularly different on the 2 halves of the bivalent. Each half of the 14th bivalent is usually labelled more heavily than the less heavily labelled half of the 7th bivalent. These observations are discussed in relation to the involvement of nucleolar organizers in gene amplification and rectification. More... »

PAGES

415-426

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00399409

DOI

http://dx.doi.org/10.1007/bf00399409

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1008281744

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/4730559


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