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The genetics of Dacus oleae: III. Amount of variation at two esterase loci in a Greek population

Published online by Cambridge University Press:  14 April 2009

E. Zouros  and
C. B. Krimbas
E. Zouros
Affiliation:
Department of Genetics, College of Agriculture, Athens, Greece
C. B. Krimbas
Affiliation:
Department of Genetics, College of Agriculture, Athens, Greece
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Two polymorphic esterase loci, EstA and EstB, of the olive-fruit fly Dacus oleae were studied in a natural population. The analysis of about 500 individuals revealed the presence of 15 alleles for EstA and 12 alleles for EstB. A ‘silent’ allele was found segregating at both loci. Segregation data for most of the alleles are presented. The allele frequency distribution follows the same pattern at both loci: one allele of each gene has a frequency of nearly 0·50, a few have frequencies between 0·05 and 0·15 and many are below 0·05. Two main hypotheses, those of overdominance and selective neutrality, were examined in order to explain these polymorphisms. We deduced that under both hypotheses a relatively high mutation rate is necessary to balance the result of random drift. This rate was estimated to be higher than 4 × 10−5 for the EstA locus. Since homozygotes for the ‘silent’ allele at the first or at the second locus were found in the population in expected frequencies, it was concluded that these alleles are not inferior to active ones under natural conditions.

Type
Research Article
Information
Genetics Research , Volume 14 , Issue 3 , December 1969 , pp. 249 - 258
Copyright
Copyright © Cambridge University Press 1969

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