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Type: Artigo de periódico
Title: Genetic load caused by variation in the amount of rDNA in a wasp
Author: Araujo, SMSR
Silva, CC
Pompolo, SG
Perfectti, F
Camacho, JPM
Abstract: Extensive variation in the size of the short ( heterochromatic) arm of chromosome 14 was found in the wasp Trypoxylon (Trypargilum) albitarse. Ten different variants were differentiated by size and C-banding pattern. Fluorescent in-situ hybridization ( FISH) revealed that ribosomal DNA in this species is clustered in the darkly C-banded parts of the heterochromatic short arm of chromosome 14. On this basis, we got an indirect estimate of the amount of rDNA from the area of these dark C-bands. The significant absence in males of the three chromosome variants with lower amounts of rDNA indicates that these three variants are lethal in this sex, and suggests the existence of a threshold marking the minimum amount of rDNA which is tolerable in haploidy. This implies about 4% genetic load in the population caused by variation in rDNA amount.
Subject: genetic load
nucleolus organiser
Trypoxylon albitarse
Country: Holanda
Editor: Kluwer Academic Publ
Citation: Chromosome Research. Kluwer Academic Publ, v. 10, n. 7, n. 607, n. 613, 2002.
Rights: fechado
Identifier DOI: 10.1023/A:1020970820513
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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