Abstract
CENTRIC heterochromatin in Drosophila metaphase chromosomes is organised into large blocks which show various degrees of condensation in prometaphase1 and various degrees of decondensation when living cells are Hoechst treated2. By sequential staining with the fluorescent dyes Hoechst and quinacrine, three different types of blocks are distinguishable in D. virilis. Each block seems to contain only one DNA satellite and similar staining blocks, along with their respective satellite, appear or disappear as units during speciation; this was first suggested from a study of D. hydei sibling species1 and here confirmed for the D. virilis group.
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HOLMQUIST, G. Organisation and evolution of Drosophila virilis heterochromatin. Nature 257, 503–506 (1975). https://doi.org/10.1038/257503a0
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DOI: https://doi.org/10.1038/257503a0
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