Abstract
Surface-spread polytene (SSP) chromosomes of salivary glands from late third-instar larvae were used for the construction of an electron microscopic (EM) photo map of the entire genome of D. hydei. In comparison with the light microscopic chromosome map of Berendes (1963), based on squash preparations, the EM micrographs depict some 40%–50% more bands. — Two different types of chromosome constrictions are described. One type is assumed to be caused by differential distribution of chromosomal proteins; the other one appears to represent underreplicated sections in the salivary gland chromosomes.
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