Abstract
A strain difference was found in the pancreatic α-amylase in rat strains, Rattus norvegicus. This variation is under the genetic control of a single locus, Amy-1. The locus Amy-1 contains dominant and recessive alleles, Amy-1a and Amy-1b, which correspond to the positive and negative expression of the minor band, respectively. An electrophoretic survey of small intestine esterases showed a new phenotype controlled by Es-3 locus. Linkage tests showed 8.5% recombination frequency between Es-1 and Es-3 loci on linkage group V. Amy-1 and Es-1 loci did not belong to the same linkage group.
