Genetic regulation of the replication pattern of polytene chromosomes in interspecific hybrids of Drosophila |
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| Authors: | M B Evgeniev I S Gubenko |
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| Institution: | (1) Department of Molecular Organization of Chromosomes, Institute of Molecular Biology, U.S.S.R., Academy of Sciences, 117334 Moscow, U.S.S.R.;(2) Department of General Cytology, Institute of Cytology and Genetics, U.S.S.R. Academy of Sciences, Siberian Department, 630090 Novosibirsk, U.S.S.R. |
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| Abstract: | The sixth chromosome (microchromosome) of D. littoralis changed its replication pattern in nuclei of the salivary gland cells in reciprocal F1 hybrids between D. virilis and D. littoralis. — To locate the factor (or factors) in the D. virilis chromosomes, which may influence the replication pattern of the sixth chromsome of D. littoralis, we produced hybrid stocks with  synthetic karyotypes characterized by different combinations of D. littoralis homologous chromosomes and hybrid chromosomes. Based on autoradiographical studies of DNA synthesis in synthetic karyotypes, it may be concluded that the dominant factor (or factors), which influences the replication of the sixth chromosome of D. littoralis, is located on the homeologous microchromosomes of D. virilis. The possible interrelation between the changed replication pattern of D. littoralis sixth chromosome and its atypical behaviour at early embryogenesis in (D. virilis x D. littoralis) F1 hybrids is discussed. |
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