IN a previous paper we have shown that the pattern of the same giant chromosomes can differ from cell to cell even in the same tissue of a Chironomus larva1. Furthermore, the same giant chromosome structure in different tissues shows normally a different pattern2–6. The latter differences are clearly greater than those of the chromosome in the same tissue. On the other hand, an examination of giant chromosomes in the mid-gut and in the salivary gland of Sciara larva led Berger to the conclusion that the pattern of the mid-gut chromosomes is identical with that of the salivary gland chromosomes7. I have investigated both these points with a different object, namely, Drosophila repleta. Giant chromosomes closely resembling those of the salivary gland can be found in various somatic tissues in the larvæ of D. repleta. They are, however, smaller and have fewer cross-bands than the salivary gland chromosomes. The same phenomenon was observed in D. virilis by Makino8. Besides the salivary gland chromosomes, those in the cells at the base of the large tracheal tubes give the most satisfactory results.
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SENGÜN, A. Difference in Structure between the same Giant Chromosomes from the same Larv of Drosophila repleta. Nature 163, 1002 (1949). https://doi.org/10.1038/1631002a0