Genetic studies on the pacific abalone. XIX. Estimating rate of gene-centromere recombination at alpha-glycerophosphate dehydrogenase, superoxide dismutase, and esterase loci in the pacific abalone.

Abstract

Analyses on genotypic compositions in parents and their normal diploid and triploid offspring sib populations have made it possible to estimate rate of gene-centromere recombination at seven loci in the pacific abalone Haliotis discus hannai. Similar analyses on parentage in genotypic compositions in the three mating groups of the Pacific abalone allowed to estimate rate of gene-centromere recombination at alpha-glycerophosphate dehydrogenase, superoxide dismutase, and esterase·M loci. Comparisons between the observed and expected frequencies of genotypes dis-closed a significant excess of homozygotes at Es•M locus commonly in normal diploid and triploid offspring sib populations in some mating group but not in the other. The observation on normal diploid seemed to be consonant with those reported before on juvenile animals sampled from wild population. A series of more careful examination on probable involvement of some influencing mechanism (s) in the occurrence of deviations in genotypic compositions at the locus is now under way.