Abstract
The tenebrionid beetles Tribolium castaneum and T. confusum are representative of two distinct species groups within their genus. It has been suggested [Smith, S. G. (1952). J. Morphol. 91:325] that the 8AA + neo-XY karyotype of T. confusum was derived from the ancestral 9AA + XY formula, still present in T. castaneum, via the fusion of one pair of autosomes with the X and Y chromosomes during the early divergence of the confusum and castaneum species groups. In the present paper, electrophoretic variation in malic enzyme and hexokinase-1, detected in laboratory strains in Tribolium, is described. Evidence is presented that the genes encoding variation in both enzymes are autosomal in T. castaneum but are X linked in T. confusum. These species-specific patterns of inheritance of homologous gene loci are consistent with the hypothesized karyotypic history of the genus.
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This work was supported by national Science Foundation Grant DEB 77-25569 to RAR.
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Samollow, P.B., Dawson, P.S. & Riddle, R.A. X-linked and autosomal inheritance patterns of homologous genes in two species of Tribolium . Biochem Genet 21, 167–176 (1983). https://doi.org/10.1007/BF00498908
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DOI: https://doi.org/10.1007/BF00498908