Abstract
1.1. Zymograms indicate the existence of three loci coding for lactate dehydrogenase in the nine-spined stickleback Pungitius pungitius.2.2. The skeletal muscle locus is polymorphic for two codominant alleles: Ldh-A (100) and Ldh-A (140).3.3. Differences in allele frequencies among nine samples, obtained from eight geographically isolated populations, proved not significant in 28/36 pairwise comparisons. The frequency of Ldh-A (100) varied from 0.426 to 0.715.4.4. Significant differences in apparent Km (pyruvate) values were found among the LDH-A allozymes suggesting a functional basis for the selective maintenance of this polymorphism.
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