Abstract
The polytene chromosomes of six species of Parasarcophaga were examined by C-, quinacrine (Q)-, Hoechst 33258 (H)-, Hoechst/actinomycin D (H/AMD)- and acridine orange (AO)- staining methods to characterize their heterochromatin. In the polytene karyotype the sex chromosomes do not polytenize and are represented by a granular mass of heterochromatin which is C+, Q+, H+ and fluoresces yellowish green with acridine orange. The autosomal elements reveal an identical distribution of heterochromatin with all the banding techniques and the fluorescence characteristics indicate AT-rich fast-reassociating DNA in these regions. Thus, in the polytene system of Parasarcophaga besides the underreplicative heterochromatin there is a considerable amount of heterochromatin which seems to be correplicative during polytenization.
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Kaul, D., Agrawal, U.R. & Tewari, R.R. Characterization of Parasarcophaga heterochromatin. Chromosoma 98, 56–63 (1989). https://doi.org/10.1007/BF00293335
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DOI: https://doi.org/10.1007/BF00293335