Abstract
A highly repeated family of sequences from the grasshopper Caledia captiva shows a dispersed distribution at the cytological level. Members of this 185 bp sequence family are not restricted to C-band heterochromatin, but rather are distributed in regions which appear as euchromatin in C-banded chromosomes. Sequence variation in this family is equivalent (14%–16%) at all levels of taxonomic comparison from within a population to between species. However, contiguous repeats demonstrate a much lower level of variation (9%). These, and other data, indicate that the concept of sequence “homogeneity” within a family of highly repeated sequences must be qualified with respect to the extensive variation between members of a given family. Comparison of the data for the 185 bp family with those from a study of a second highly repeated family, from the same taxon, demonstrates divergent patterns of evolution. Thus, the 185 bp repeats show much greater sequence variation, as well as a seemingly random pattern of incorporation of base pair alterations. The factors which may contribute to the observed pattern of variation include the time since the sequence family originated, its cytological distribution, the frequency of unequal crossing over and gene conversion and natural selection.
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Arnold, M.L. The heterochromatin of grasshoppers from the Caledia captiva species complex. Chromosoma 94, 183–188 (1986). https://doi.org/10.1007/BF00288492
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DOI: https://doi.org/10.1007/BF00288492