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Diptera: Simuliidae. Three additional inversions were found heterozygously in low frequency, all except IIL-8 Fig 4B in male larvae. Macrochromosomes showed a preferential accumulation of microsatellites in centromeric and telomeric regions in pairs 1, 2, 3 and 5 in all species, while pair 4 showed signals only in Colaptes Fig 5A and 5B.
We analyzed the banding structure of the larval polytene chromosomes in the Simulium tuberosum species group to probe for diversity beyond the morphological level. Ecologically, the S.
Harrison A carrier can pass this abnormal gene to his or her children. Genes located on the X chromosome are called X-linked genes, and these genes determine X sex-linked traits. Comparative Cytogenetics. December Wikimedia Commons has media related to Sex chromosomes.
Instead, some of these sequences were found accumulated in both Z chromosome arms which could explain the fact that it is the largest chromosome in these species. Canadian Journal of Zoology 31 : — Biological Journal of the Linnean Society : 13— Four cytoforms were found among 3 morphoforms in the S.
Simulium bergi shows a concentration of inversions between sections 60 and 65, with additional, albeit fewer, inversions breaking beyond this segment. The chromosomal banding sequences of all stained larvae were compared with maps of the standard reference sequence for the subgenus Simulium.
Of the 18 nominal species in the Simulium venustum group analyzed chromosomally Adler and Crosskey , Simulium bergi is the least differentiated—only one inversion IIS-C removed from the subgeneric standard.