Abstract
The electrophoretic mobility of enzymes in polyacrylamide gels was used a measure of genetic variability in deep-sea echinoderms. Both variable and monomorphic species were found. The levels of polymorphism and heterozygosity were similar to those of species living in shallow-water and terrestrial environments, evidence that these are unrelated to climatic stability. We propose that polymorphism is more probably related to the intensity of selection pressures and a reflection of biological fluctuations. A tendency toward a deficiency of heterozygotes from the number expected in Hardy-Weinberg equilibrium suggests that populations of the ophiuroid Ophiomusium lymani may be genetically isolated.
Published Version
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