Abstract
Genetic variation of the enzyme phosphohexose isomerase (PHI) was found in the erythrocytes of Australian domestic cats [Felis catus L.] by horizontal starch gel electrophoresis at pH 8.2. Three complex patterns of isoenzymes, designated F, FS and S, were obtained migrating anodally. Limited family studies and the distribution of the 3 main phenotypes indicated that the polymorphism is controlled by 2 codominant autosomal alleles, PHIF and PHIS. Gene frequencies for PHIF and PHIS were calculated as 0.036 and 0.964, respectively. Three additional variant forms were also observed.