12 research outputs found
Divergence of genomic DNA in species of the subgenus Camptochironomus (Diptera, Chironomidae) differing in their cytogenetic similarity levels
No full textThe role of chromosomal polymorphism in divergence of populations and species of the genus Chironomus (Diptera)
No full textChromosomal variability in natural populations of Chironomus cingulatus meigen (Diptera, Chironomidae)
No full textVariability of Nucleotide Sequences in the ITS1–5.8S rRNA–ITS2a–2S rRNA–ITS2 Region of rRNA Gene Cluster in Species of the Family Chironomidae
No full textCytogenetic differentiation of natural populations of Chironomus obtusidens (Diptera, Chironomidae)
No full textDivergence patterns of banding sequences in different polytene chromosome arms reflect relatively independent evolution of different genome components
No full textGeographic variability of the polytene chromosome banding sequence of non-biting midge Chironomus pseudothummi Str. (Diptera, Chironomidae)
No full textGenotoxic effects of chromium onpolytene chromosomes of Chironomus riparius
No full textAbstract Genotoxic effect as tested of chronic exposure to three different concentrations of Chromium (III) on polytene chromosomes of larvae of Chironomus riparius (syn. Chironomus thummi) from the embryonic stage to the IV larval instar for two successive generations. In chromosomes AB, CD, EF and G significant differences of chromosome aberrations were found between exposed and control larvae as well as changes in functional activity (induction of novel puffs not corresponding to those induced during normal larval development in arms A, B, C and E, telomeric and centromeric decondensations especially at telomeres of chromosome G and arm C.). No significant differences were found between the effects of the three treatments nor between the two generations. In chromosome G the Balbiani Ring system (where some permanently active regions are involved in transcription of salivary proteins) appeared as a model for studying the response of the genome to Cr (III) treatment. In approximately one-third of the cel..
