Abstract
DNA sequence divergence was analyzed in some sibling species of the Drosophila virilis group. Clones comprising about 0.1% of the genome DNA were selected at random from a D. virilis library for a comparative study on DNA from D. lummei, D. novamexicana, D. borealis, and D. lacicola. Blot hybridization experiments indicated that about 70% of DNA from D. lummei and D. novamexicana and less than 50% of DNA from D. borealis and D. lacicola share sequences that are homologous to DNA in D. virilis. This finding is in excellent agreement with the genealogical tree based on cytological studies (Throckmorton 1982). — Four plasmids with inserts which are present in one or a few copies per genome were hybridized in situ to polytene chromosomes. These experiments demonstrate that (1) homologous “unique” DNA sequences are localized exclusively in homologous bands and (2) homologous bands that appear to be identical in different species may contain different DNA sequences.
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Riede, I., Jacob, E. & Renz, M. DNA sequence divergence in the Drosophila virilis group. Chromosoma 88, 109–115 (1983). https://doi.org/10.1007/BF00327330
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DOI: https://doi.org/10.1007/BF00327330