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Type: Artigo de periódico
Title: Genetic Load Caused By Variation In The Amount Of Rdna In A Wasp.
Author: Araújo, S M S R
Silva, C C
Pompolo, S G
Perfectti, F
Camacho, J P M
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: Animals
Chromosome Banding
Dna, Ribosomal
Genetic Load
Genetic Variation
In Situ Hybridization, Fluorescence
Sex Factors
Citation: Chromosome Research : An International Journal On The Molecular, Supramolecular And Evolutionary Aspects Of Chromosome Biology. v. 10, n. 7, p. 607-13, 2002.
Rights: fechado
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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