Abstract
Extensive variation in heterochromatin exists in natural populations of Baetica ustulata, as deduced following the application of C and G banding techniques. These techniques enable us to describe nine C-heterochromatin variants for the M chromosomes (M3, M4 and M5) and to distinguish between the response of several classes of heterochromatin to G-banding. Different populations of this species are very different for the C-heterochromatin variants, which is due to their geographical isolation, the low mobility of these insects and the extensive intrapopulational variation which, as we propose, may be increased by meiotic recombination. Three classes of response to G banding show the different C-heterochromatic regions analysed. Firstly, a contrary response is shown by the nucleolar associated heterochromatin interstitially located in the long arm of L2 chromosome so that it C-bands darkly but G-bands lightly. Secondly, a parallel response to both techniques is demonstrated by centromeric heterochromatin. Thirdly, the large heterochromatic blocks in the M chromosomes show dark C-banding but “grey” G-banding, being those in M3 and M4 surrounded by small dark G-bands.
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Navas-Castillo, J., Cabrero, J. & Camacho, J. Heterochromatin variants in Baetica ustulata (Orthoptera: Tettigoniidae) analysed by C and G banding. Heredity 56, 161–165 (1986). https://doi.org/10.1038/hdy.1986.27
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DOI: https://doi.org/10.1038/hdy.1986.27
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