Conservative genome size and rapid chromosomal evolution in the South American tuco-tucos (Rodentia: Ctenomyidae).

Ruedas, L A; Cook, J A; Yates, T L; Bickham, J W

Ruedas, L A; Cook, J A; Yates, T L; Bickham, J W.

Afiliação

Ruedas LA; Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station 77843-2258.

Genome ; 36(3): 449-58, 1993 Jun.

Article em En | MEDLINE | ID: mdl-8349125

RESUMO

Genome size (the amount of DNA per cell) was measured by flow-cytometric analysis in seven species of a chromosomally variable rodent genus: Ctenomys boliviensis, C. conoveri, C. frater, C. leucodon, C. lewisi, C. opimus, and C. steinbachi. The mean genome size of these species was 7.19 pg DNA and little inter- and intra-specific variation was observed. Genome size was not correlated with diploid number, suggesting that chromosomal evolution at this level is independent of total DNA content. A hypothetical taxonomic unit optimization procedure was carried out using genome size change on a Wagner tree derived from allozyme data. Allozyme evolution and genome size change are linked by a weak, but significant, negative correlation suggestive of preferential genic evolution in the absence of genome size evolution.

Assuntos

Evolução Biológica; Genoma; Roedores/genética; Animais; Bolívia; Cromossomos; DNA/análise; DNA/genética; Variação Genética; Filogenia; Especificidade da Espécie

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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Roedores / Genoma / Evolução Biológica Limite: Animals País/Região como assunto: America do sul / Bolivia Idioma: En Revista: Genome Assunto da revista: GENETICA Ano de publicação: 1993 Tipo de documento: Article País de publicação: Canadá

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