Gene duplication within the family salmonidae: disomic inheritance of two loci reported to be tetrasomic in rainbow trout

Abstract

The genetics of allelic variation for NADP dependent isocitrate dehydrogenase (IDH) in rainbow trout (Salmo gairdneri) was studied. 5 populations of rainbow trout were studied to determine the phenotypic distribution of IDH; 453 progeny from a number of controlled matings were examined to determine the nature of inheritance of these alleles. The variation was found to be the result of 4 alleles producing protein subunits of differing electrophoretic mobilities. Progeny from crosses clearly demonstrated the presence of 2 disomic loci controlling the variation, rather than 1 tetrasomic locus as had been previously reported.