Abstract
Starch gel electrophoresis of sonicated rabbit red cells using a modified system of buffers gave a maximum of 24 zones of esterase activity with α-naphthyl acetate as substrate, 23 with α-naphthyl propionate, and 20 with α-naphthyl butyrate. Seventeen of the zones common to gels developed with any of these substrates were divided into three systems of isozymes, one of which, genetic system 1, has been previously described by Grunder et al. (1965). The zones of system 2 migrated between those of system 1 and those of system 3, the most anodal system. Each of these new systems, like system 1, consisted of three phenotypes controlled, respectively, by a pair of codominant autosomal alleles. In 10 test-cross matings involving systems 1 and 2, not more than two of four possible phenotypes were observed in the offspring of each family, thereby indicating close linkage of the two loci. Based on those matings, the probability that the two loci are independent was less than 0.0001.
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