Abstract

Heterozygosity at nine electrophoretically variable allozyme loci was studied in relation to weight and length in approximately 1600 sixteen-week-old oysters ( Crassostrea virginica) produced from five pair crosses. There was little evidence that heterozygosity itself was important in determining growth rates within crosses, either in single-locus or in multi-locus comparisons. There was evidence that some allelic substitutions at the aminopeptidase-1 locus may have had an effect on growth. This result indicates either that some allelic substitutions within an allozyme locus affect growth and others do not, or that the effect is due to a growth-affecting gene that is linked to the allozyme locus.

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