Abstract
Alcohol dehydrogenase (ADH) activity variation in male flies taken directly from seven natural populations ofDrosophila melanogaster is largely accounted for by segregation of alleles at theAdh structural gene locus. There was little overlap in the ADH activities ofAdhF andAdhs homozygotes. Body weights varied only slightly betweenAdh genotypes and contributed little to ADH variation. Between and within population variation in ADH activity and ADH protein in flies in the wild is mainly due to the relative frequencies ofAdhF andAdhs.
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