Abstract
Previous studies with rainbow trout (Oncorhynchus mykiss) have shown that allozymic heterozygotes have increased developmental stability, as measured by reduced fluctuating bilateral asymmetry. In this paper, we examine the phenotypic effects of null alleles at two lactate dehydrogenase (LDH) loci. If the association between allozymic heterozygosity and developmental stability is due largely to linked chromosomal segments, then we would expect null allele heterozygotes to have increased developmental stability. In contrast, heterozygotes for LDH null alleles in three populations have reduced developmental stability. This suggests that the reduction in enzyme activity at these loci is having a deleterious effect on development that is strong enough to mask any beneficial effects that may be associated with heterozygosity for these chromosomal segments. The LDH loci examined in this study are members of two different paralogous pairs of duplicate genes produced by the polyploidization of the ancestral salmonid genome. The apparent deleterious effects of these null alleles in heterozygotes could retard the possible loss of duplicate gene expression.
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Leary, R.F., Allendorf, F.W. & Knudsen, K.L. Null alleles at two lactate dehydrogenase loci in rainbow trout are associated with decreased developmental stability. Genetica 89, 3–13 (1993). https://doi.org/10.1007/BF02424501
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DOI: https://doi.org/10.1007/BF02424501