エゾアワビ3倍体集団のフォスフォグルコネ-ト脱水素酵素遺伝子座における生存度の超優性〔英文〕

概要

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Evidence has been provided on overdominance of heterozygote or heterosis in survival at single locus, coding esterase and phosphogluconate dehydrogenase in wild population of the pacific abalone Haliotis discus hannai. Successful development of the techniques for inducing two kinds of triploid sib animals has made it possible to evaluate performance of triploid populations in comparison with that of their sib normal diploid animals. The present work analyses meiotic processes of transmitting parental genomes to their off-springs, attempts to estimate rate of gene-centromere recombination among homologous chro-matids, examines to see if overdominance of heterozygote or heterosis in survival is involved at phosphogluconate dehydrogenase locus, and discusses possible effect of the recombination to heterorygosity/homozygosity in triploid animals and its impact on their performance of the animals, induced and reazed under experimental conditions.