The repetition frequency of DNA in Balbiani ring 2 of Chironomus thummi

作者: Ulrich Wobus , Edgar Serfling

DOI: 10.1007/BF00328082

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摘要: The RNA of Balbiani ring BR2 polytene chromosomes from Chironomus thummi salivary glands was microisolated and reassociated in the presence an excess total larval DNA. reacts as a single component with C0t1/2 8.6. Ribosomal precursor nucleoli reassociates under identical conditions 12.3. These C0t1/2-values suggest repetition frequencies range 35 50 for ribosomal DNA 2 DNA, respectively. data presented here favour view that gene C. is internally repeated contains only one type sequence.

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